Professional + Subprofessional

Civil Service Exam grammar: what's tested, and where points are leaked.

Last reviewed May 2026

Grammar is the most teachable subtest on the paper. Vocabulary rewards a lifetime of reading. Reading comprehension rewards practice. But grammar follows a small set of rules you can master in a focused week, even if you've been leaking points to the same five mistakes for years. The CSC writers know exactly which mistakes are common, so their items target a predictable list. Once you know the list, you can hunt for the trap instead of being surprised by it.

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Quick facts

Primary subtest: Verbal Ability
Languages: English + Filipino
Level: Professional and Subprofessional
Difficulty to improve: Medium

What gets tested, by item type

CSC grammar items appear in three formats. Learn to spot which one you're looking at before you start solving.

Identify the error: a sentence with four underlined segments. You pick the one containing the grammatical error (or "no error").
Correct version: a sentence followed by four rewordings. You pick the cleanest version.
Complete the sentence: a blank with four grammatical options.

English: subject-verb agreement, pronoun-antecedent agreement, parallel structure, verb tense consistency, modifier placement, comparative and superlative forms, prepositional usage.
Filipino: pang-uri-pangngalan agreement, panghalip references, and the use of "ng" versus "nang."

Where the points are Three topics tend to dominate past grammar items: subject-verb agreement, pronoun reference, and parallel structure. The CSC does not publish a per-topic breakdown, so treat that as a pattern from practice papers, not an official weighting. If you only have a week to study grammar, those three are where every hour pays back hardest.

The five mistakes that cost the most points

These five account for most of the points test-takers leak on grammar. Learn to recognize each one on sight.

Subject-verb agreement with a phrase between the subject and verb. "The list of items are on the desk" reads naturally but is wrong. The subject is "list," not "items," so the verb should be "is." CSC items routinely insert a long prepositional phrase between subject and verb to bait this error.
Pronoun-antecedent agreement with indefinite pronouns. "Everyone brought their book" is conversational English but ungrammatical for the exam. "Everyone" is singular, so the pronoun should be "his" or "her" or "his or her." The same trap appears with "each," "either," "neither," and "none."
Faulty parallelism in lists. "She likes hiking, swimming, and to read" mixes gerunds with an infinitive. Either all three should be gerunds ("hiking, swimming, and reading") or all three infinitives ("to hike, to swim, and to read"). CSC writers love this trap because it sounds fine until you stop and look.
Verb tense shifts mid-sentence. "When he arrived, she was cooking and starts to clean up" jumps from past to past-progressive to present. The exam expects consistent tense within a sentence unless the meaning genuinely requires a shift.
"Ng" versus "nang." "Ng" links nouns and shows possession ("libro ng bata"). "Nang" introduces adverbial clauses, manner, or repetition ("tumakbo siya nang mabilis," "tatlong beses nang umulan"). This is a common miss because casual usage blurs the two, so it is worth drilling deliberately.

The fixed-rule list (memorize these)

These rules don't change from paper to paper. Memorize them and you can answer on sight.

Collective nouns take a singular verb when acting as one unit: "The committee decides today." They take a plural verb when acting as individuals: "The committee disagree among themselves." When in doubt, singular is the safer pick.
Compound subjects joined by "and" take a plural verb. Compound subjects joined by "or" or "nor" take the number of the nearer subject: "Neither the manager nor the clerks are responsible."
Comparative forms ("-er," "more") compare two things. Superlative forms ("-est," "most") compare three or more. "Of the two candidates, she is the better one," not "best."
Modifiers go next to the word they modify. "She almost drove her kids to school every day" means she nearly drove them. "She drove her kids to school almost every day" means she did it most days. The CSC tests this by giving you both versions and asking which is correct for the intended meaning.
"Less" is for quantities you can't count (less water, less time). "Fewer" is for things you can count (fewer people, fewer items). The supermarket sign that says "10 items or less" is technically wrong, and the CSC will mark it wrong too.

How to drill: one focused week beats four scattered ones

A week of deliberate practice fixes grammar for most people. Follow this day-by-day plan.

1
Days 1 to 3
Subject-verb agreement and pronoun reference. Do thirty items per day, untimed, looking up every rule you miss. Keep a one-page error log: write down the rule each mistake violated. This log is your study material. The textbook is just where you check the rule.
2
Days 4 to 5
Parallel structure and verb tense. Same drill pattern. By day five, you should be missing fewer than three items per twenty.
3
Day 6
Filipino grammar focused on "ng" versus "nang," pang-uri agreement, and panghalip references. The DepEd K-12 Filipino curriculum guides are the cleanest source for the rules.
4
Day 7
Forty-item mixed grammar set under a clock, twenty-five seconds per item. This simulates exam pacing. If you can hit 80% under time, you've fixed grammar.

Worked examples

These items are written specifically for this guide. The actual practice bank pulls from a separate pool of original CSE-style items reviewed by passers.

Item 01
The supervisor, along with the three new clerks, __________ on leave this week.
- Aare
- BisCorrect
- Cwere
- Dhave been
Explanation. The subject is "supervisor" (singular). The phrase "along with the three new clerks" is a prepositional phrase, not part of the subject, so it doesn't make the subject plural. The verb is "is." The plural-looking phrase between subject and verb is the standard CSC bait.
Item 02
Neither the manager nor the employees __________ aware of the policy change.
- Awas
- Bis
- CwereCorrect
- Dhas been
Explanation. With "neither/nor" the verb agrees with the nearer subject. "Employees" (plural) is closer to the verb, so the verb is "were." If the order were reversed to "Neither the employees nor the manager," the verb would be "was." CSC items routinely test both orders to catch test-takers who memorized a half-rule.
Item 03
Each of the candidates must submit __________ requirements before the deadline.
- Atheir
- Bhis or herCorrect
- Cthey
- Dour
Explanation. "Each" is singular, so the pronoun referring to it must also be singular. "Their" is conversationally acceptable but the CSC marks it wrong on grammar items, because the exam follows formal written rules. "His or her" is the correct singular pronoun phrase. The same logic applies to "everyone," "either," "neither," and "someone."
Item 04
Choose the sentence with correct parallel structure.
- AShe enjoys reading, to hike, and swimming.
- BShe enjoys reading, hiking, and to swim.
- CShe enjoys reading, hiking, and swimming.Correct
- DShe enjoys to read, hiking, and swimming.
Explanation. Parallel structure requires that items in a list share the same grammatical form. Option C uses three gerunds ("-ing" verbs as nouns). The other three options mix gerunds and infinitives, which is the most common parallelism error on the exam.
Item 05
Of the two applicants who were interviewed, Maria was the __________ qualified.
- AmoreCorrect
- Bmost
- Cvery
- Dmuch
Explanation. When comparing exactly two things, use the comparative form ("more," or the "-er" ending). "Most" is the superlative, used for three or more. Casual English uses "most" loosely; the CSC tests whether you can spot it.
Item 06
Piliin ang pangungusap na gumagamit ng tamang "ng" o "nang."
- ATumakbo siya ng mabilis pauwi.
- BTumakbo siya nang mabilis pauwi.Correct
- CTumakbo nang siya nang mabilis pauwi.
- DTumakbo ng siya ng mabilis pauwi.
Explanation. "Nang" introduces an adverb of manner ("mabilis" describes how he ran). "Ng" is used to link nouns or show possession ("libro ng bata"). The casual habit of using "ng" for everything is the trap, and it is a frequent miss because everyday usage blurs the distinction.
Item 07
Walking down the corridor, __________.
- Athe fire alarm suddenly sounded.
- Bthe manager noticed the broken window.Correct
- Cthe lights were flickering above.
- Dthe documents fell from the shelf.
Explanation. A participial phrase like "walking down the corridor" must modify the subject of the main clause, and only a person can walk. Options A, C, and D give us fire alarms, lights, and documents that supposedly walked, which is a dangling modifier. Only option B has a human subject the participle can attach to.

Want twenty more like these, under a clock?

The civil service exam grammar & correct usage reviewer drill runs ten or twenty items with full explanations and tracks which traps you fall for most often. Included with a paid plan.

Start the drill →Or take the free diagnostic

Study tactics that actually move the score

01
Read every sentence twice on grammar items: once for meaning, once for structure. Most errors are invisible on a first pass because the sentence sounds fine. The exam tests whether you can switch your brain into structural-reading mode.
02
Keep a one-page error log of every rule you miss. Review only that log for the week before the exam. Textbooks are for learning the rule; the log is what cements it.
03
When two options seem equally plausible, pick the more formal one. The CSC tests formal written register: "his or her" beats "their" even when "their" is conversationally fine.
04
Don't trust your ear on Filipino "ng" versus "nang." Casual speech blurs them. Force yourself to articulate the rule before answering: is it linking nouns (ng) or describing how/when (nang)?
05
Practice under time. Untimed grammar drills teach you the rules; timed drills teach you to apply them fast enough to actually finish the paper.

Frequently asked questions

How many grammar items appear on the CSE Professional paper?

The CSC does not publish a per-topic or per-subtest item count, so any exact number you see online is an estimate. What is official: the Professional paper has 170 items total and the Subprofessional paper has 165, and grammar and correct usage fall under the Verbal Ability subtest. Both levels use the same trap structures.

Is American or British English used on the exam?

American English, including spelling ("color" not "colour") and usage conventions. The CSC follows Philippine English, which inherits its rules from American English.

Are colloquial answers ever correct?

No. The exam tests formal written English and formal Filipino. "Everyone brought their book" is fine in conversation but marked wrong on the exam. When in doubt, pick the more formal option.

Should I memorize a grammar textbook?

No. Drill twenty items a day, look up each rule you miss, and keep a one-page error log. After two weeks the log will cover 90% of the rules the CSC actually tests. Textbook front-to-back reading is slow and forgettable.

What's the difference between "who" and "whom" on the exam?

"Who" is the subject form; "whom" is the object form. The shortcut: rephrase the sentence to use "he/she" or "him/her" in place of who/whom. If "he" fits, use "who." If "him" fits, use "whom." The exam tests this maybe once per paper but the rule is reliable.

Related subjects

Stop reading. Start finding your floor.

Forty questions across all four subtests. Forty minutes. See exactly where you stand against the 80% pass mark. No signup, no card.

Take the free diagnostic →Create free account

Or drill civil service exam grammar & correct usage reviewer (included with a paid plan).

Professional + Subprofessional

Civil Service Exam grammar: what's tested, and where points are leaked.

Last reviewed May 2026

Take the free diagnostic Create free account

Or drill civil service exam grammar & correct usage reviewer (included with a paid plan).

Quick facts

Primary subtest: Verbal Ability
Languages: English + Filipino
Level: Professional and Subprofessional
Difficulty to improve: Medium

What gets tested, by item type

CSC grammar items appear in three formats. Learn to spot which one you're looking at before you start solving.

Identify the error: a sentence with four underlined segments. You pick the one containing the grammatical error (or "no error").
Correct version: a sentence followed by four rewordings. You pick the cleanest version.
Complete the sentence: a blank with four grammatical options.

English: subject-verb agreement, pronoun-antecedent agreement, parallel structure, verb tense consistency, modifier placement, comparative and superlative forms, prepositional usage.
Filipino: pang-uri-pangngalan agreement, panghalip references, and the use of "ng" versus "nang."

The five mistakes that cost the most points

These five account for most of the points test-takers leak on grammar. Learn to recognize each one on sight.

Subject-verb agreement with a phrase between the subject and verb. "The list of items are on the desk" reads naturally but is wrong. The subject is "list," not "items," so the verb should be "is." CSC items routinely insert a long prepositional phrase between subject and verb to bait this error.
Pronoun-antecedent agreement with indefinite pronouns. "Everyone brought their book" is conversational English but ungrammatical for the exam. "Everyone" is singular, so the pronoun should be "his" or "her" or "his or her." The same trap appears with "each," "either," "neither," and "none."
Faulty parallelism in lists. "She likes hiking, swimming, and to read" mixes gerunds with an infinitive. Either all three should be gerunds ("hiking, swimming, and reading") or all three infinitives ("to hike, to swim, and to read"). CSC writers love this trap because it sounds fine until you stop and look.
Verb tense shifts mid-sentence. "When he arrived, she was cooking and starts to clean up" jumps from past to past-progressive to present. The exam expects consistent tense within a sentence unless the meaning genuinely requires a shift.
"Ng" versus "nang." "Ng" links nouns and shows possession ("libro ng bata"). "Nang" introduces adverbial clauses, manner, or repetition ("tumakbo siya nang mabilis," "tatlong beses nang umulan"). This is a common miss because casual usage blurs the two, so it is worth drilling deliberately.

The fixed-rule list (memorize these)

These rules don't change from paper to paper. Memorize them and you can answer on sight.

Collective nouns take a singular verb when acting as one unit: "The committee decides today." They take a plural verb when acting as individuals: "The committee disagree among themselves." When in doubt, singular is the safer pick.
Compound subjects joined by "and" take a plural verb. Compound subjects joined by "or" or "nor" take the number of the nearer subject: "Neither the manager nor the clerks are responsible."
Comparative forms ("-er," "more") compare two things. Superlative forms ("-est," "most") compare three or more. "Of the two candidates, she is the better one," not "best."
Modifiers go next to the word they modify. "She almost drove her kids to school every day" means she nearly drove them. "She drove her kids to school almost every day" means she did it most days. The CSC tests this by giving you both versions and asking which is correct for the intended meaning.
"Less" is for quantities you can't count (less water, less time). "Fewer" is for things you can count (fewer people, fewer items). The supermarket sign that says "10 items or less" is technically wrong, and the CSC will mark it wrong too.

How to drill: one focused week beats four scattered ones

A week of deliberate practice fixes grammar for most people. Follow this day-by-day plan.

1
Days 1 to 3
Subject-verb agreement and pronoun reference. Do thirty items per day, untimed, looking up every rule you miss. Keep a one-page error log: write down the rule each mistake violated. This log is your study material. The textbook is just where you check the rule.
2
Days 4 to 5
Parallel structure and verb tense. Same drill pattern. By day five, you should be missing fewer than three items per twenty.
3
Day 6
Filipino grammar focused on "ng" versus "nang," pang-uri agreement, and panghalip references. The DepEd K-12 Filipino curriculum guides are the cleanest source for the rules.
4
Day 7
Forty-item mixed grammar set under a clock, twenty-five seconds per item. This simulates exam pacing. If you can hit 80% under time, you've fixed grammar.

Worked examples

These items are written specifically for this guide. The actual practice bank pulls from a separate pool of original CSE-style items reviewed by passers.

Item 01
The supervisor, along with the three new clerks, __________ on leave this week.
- Aare
- BisCorrect
- Cwere
- Dhave been
Explanation. The subject is "supervisor" (singular). The phrase "along with the three new clerks" is a prepositional phrase, not part of the subject, so it doesn't make the subject plural. The verb is "is." The plural-looking phrase between subject and verb is the standard CSC bait.
Item 02
Neither the manager nor the employees __________ aware of the policy change.
- Awas
- Bis
- CwereCorrect
- Dhas been
Explanation. With "neither/nor" the verb agrees with the nearer subject. "Employees" (plural) is closer to the verb, so the verb is "were." If the order were reversed to "Neither the employees nor the manager," the verb would be "was." CSC items routinely test both orders to catch test-takers who memorized a half-rule.
Item 03
Each of the candidates must submit __________ requirements before the deadline.
- Atheir
- Bhis or herCorrect
- Cthey
- Dour
Explanation. "Each" is singular, so the pronoun referring to it must also be singular. "Their" is conversationally acceptable but the CSC marks it wrong on grammar items, because the exam follows formal written rules. "His or her" is the correct singular pronoun phrase. The same logic applies to "everyone," "either," "neither," and "someone."
Item 04
Choose the sentence with correct parallel structure.
- AShe enjoys reading, to hike, and swimming.
- BShe enjoys reading, hiking, and to swim.
- CShe enjoys reading, hiking, and swimming.Correct
- DShe enjoys to read, hiking, and swimming.
Explanation. Parallel structure requires that items in a list share the same grammatical form. Option C uses three gerunds ("-ing" verbs as nouns). The other three options mix gerunds and infinitives, which is the most common parallelism error on the exam.
Item 05
Of the two applicants who were interviewed, Maria was the __________ qualified.
- AmoreCorrect
- Bmost
- Cvery
- Dmuch
Explanation. When comparing exactly two things, use the comparative form ("more," or the "-er" ending). "Most" is the superlative, used for three or more. Casual English uses "most" loosely; the CSC tests whether you can spot it.
Item 06
Piliin ang pangungusap na gumagamit ng tamang "ng" o "nang."
- ATumakbo siya ng mabilis pauwi.
- BTumakbo siya nang mabilis pauwi.Correct
- CTumakbo nang siya nang mabilis pauwi.
- DTumakbo ng siya ng mabilis pauwi.
Explanation. "Nang" introduces an adverb of manner ("mabilis" describes how he ran). "Ng" is used to link nouns or show possession ("libro ng bata"). The casual habit of using "ng" for everything is the trap, and it is a frequent miss because everyday usage blurs the distinction.
Item 07
Walking down the corridor, __________.
- Athe fire alarm suddenly sounded.
- Bthe manager noticed the broken window.Correct
- Cthe lights were flickering above.
- Dthe documents fell from the shelf.
Explanation. A participial phrase like "walking down the corridor" must modify the subject of the main clause, and only a person can walk. Options A, C, and D give us fire alarms, lights, and documents that supposedly walked, which is a dangling modifier. Only option B has a human subject the participle can attach to.

Want twenty more like these, under a clock?

The civil service exam grammar & correct usage reviewer drill runs ten or twenty items with full explanations and tracks which traps you fall for most often. Included with a paid plan.

Start the drill →Or take the free diagnostic

Study tactics that actually move the score

01
Read every sentence twice on grammar items: once for meaning, once for structure. Most errors are invisible on a first pass because the sentence sounds fine. The exam tests whether you can switch your brain into structural-reading mode.
02
Keep a one-page error log of every rule you miss. Review only that log for the week before the exam. Textbooks are for learning the rule; the log is what cements it.
03
When two options seem equally plausible, pick the more formal one. The CSC tests formal written register: "his or her" beats "their" even when "their" is conversationally fine.
04
Don't trust your ear on Filipino "ng" versus "nang." Casual speech blurs them. Force yourself to articulate the rule before answering: is it linking nouns (ng) or describing how/when (nang)?
05
Practice under time. Untimed grammar drills teach you the rules; timed drills teach you to apply them fast enough to actually finish the paper.

Frequently asked questions

How many grammar items appear on the CSE Professional paper?

Is American or British English used on the exam?

American English, including spelling ("color" not "colour") and usage conventions. The CSC follows Philippine English, which inherits its rules from American English.

Are colloquial answers ever correct?

No. The exam tests formal written English and formal Filipino. "Everyone brought their book" is fine in conversation but marked wrong on the exam. When in doubt, pick the more formal option.

Should I memorize a grammar textbook?

What's the difference between "who" and "whom" on the exam?

Related subjects

Stop reading. Start finding your floor.

Forty questions across all four subtests. Forty minutes. See exactly where you stand against the 80% pass mark. No signup, no card.

Take the free diagnostic →Create free account

Or drill civil service exam grammar & correct usage reviewer (included with a paid plan).