Subject–Verb Agreement and Tense: Find the Sentence Core

Find the subject and the verb that agrees with it

In “The quality of these answers is improving”, the complete subject is The quality of these answers. Its head noun, the central noun, is quality. Temporarily set aside of these answers: the sentence core is “The quality is improving”. The plural noun answers does not make quality plural.

Compare “The answer is improving” with “The answers are improving”. In these verb phrases, is/are carries the agreement; improving stays the same. Similarly, “The answer has improved” becomes “The answers have improved”. Check the actual verb phrase, rather than changing whichever word is nearest the subject.

Common agreement patterns

• Each: in standard formal writing, a subject such as each of the files takes a singular verb: “Each of the files is complete”. The sentence considers the files individually.

• Every + singular noun: “Every candidate needs an identity document”. The subject is Every candidate; every is a determiner used with the noun here, not a standalone subject.

• Two separate people joined by and: “The clerk and the assistant are ready”. They form a plural subject. Subjects joined by and generally take a plural verb, but do not turn this into a rule that ignores the meaning of the whole subject.

• A number of / the number of: “A number of applicants are waiting” refers to several applicants. “The number of applicants is increasing” concerns their count. Ask whether the sentence describes the people or the numerical total.

Worked corrections: explain the change

1. “The list of items are on the desk.” → “The list of items is on the desk.” The complete subject is The list of items; its head noun is singular list. The items are inside the describing phrase. Change are to is, not items to item.

2. “Each of the students have a book.” → “Each of the students has a book.” The subject is headed by each, so formal agreement is singular. The plural noun after of does not require have.

3. “A number of errors was found.” → “A number of errors were found.” Here a number of means several. The sentence reports that several errors were discovered, so were fits.

4. “The number of errors have fallen.” → “The number of errors has fallen.” The complete subject refers to the count of errors. That count has fallen; the plural errors does not control this verb.

Tense and time: identify the reference point

Use the simple past for a completed action at a finished past time: “She submitted the form yesterday”. The present perfect connects a past event with the present: “She has submitted the form”. In the second sentence, the submission is relevant now; the sentence does not state a finished past date for that action.

For the same submission, “She has submitted the form yesterday” is not standard: yesterday places it in a finished past period. The repair is “She submitted the form yesterday”. A past action can still matter now even when you describe it with the simple past; present importance does not cancel an explicit finished-time expression.

The past perfect can establish an earlier action relative to a past reference point: “The train had left before we reached the station”. The sequence is: the train left, then we reached the station. Had left makes that earlier departure explicit.

Do not insert had merely because a sentence describes the past. “She checked the form and submitted it” already presents a clear sequence. Past perfect is useful when looking back from a past point; it is not compulsory for every first event in a story.

Practice with reasons

Choose the best option for the stated context. These questions use standard formal English.

1. “Neither answer [blank] correct.” A. is; B. are.

A. is. Here neither directly modifies singular answer, so the subject takes singular agreement.

2. “The results of the test [blank] available.” A. is; B. are.

B. are. The head noun is plural results. Singular test belongs to the of-phrase and does not control the verb.

3. “She [blank] the office yesterday.” A. visited; B. has visited.

A. visited. Yesterday locates the visit in a finished past period, so the simple past fits.

4. “The news [blank] encouraging.” A. is; B. are.

A. is. News is grammatically singular in this use. An ending in -s does not by itself establish plural agreement.

5. “Every candidate [blank] an identity document.” A. need; B. needs.

B. needs. Every candidate is a third-person singular subject, so needs is the matching present-simple form.

6. “The final list of names [blank] been checked.” A. has; B. have.

A. has. The subject is headed by singular list. The full verb phrase is has been checked; names does not change it to have been checked.

7. “When we reached the counter, the clerk had closed it.” Which happened first? A. We reached the counter. B. The clerk closed it.

B. Had closed places the closing before our arrival. Do not assume that the action mentioned first in the sentence happened first in time.

How to review an error-spotting question

Identify the complete subject and the relevant verb phrase. Find the head noun or the expression controlling agreement. Then check the time reference and intended meaning. Correct only what is wrong: a grammatically valid sentence need not be changed merely because another wording sounds more familiar.

Some collective nouns allow different agreement depending on whether the group is viewed as a unit or as individuals, and usage can differ across varieties of English. Prefer unambiguous corrections supported by the sentence. Avoid teaching “always” rules where genuine variation exists.

These are original grammar exercises, not reproduced examination questions. The explanations teach the rule; they are not a substitute for reading the complete sentence.

References for checking usage

Purdue OWL: subject–verb agreement; Cambridge English Grammar Today: every; British Council: present perfect; British Council: past perfect; Cambridge: agreement and English varieties.