Questions: Subject-Auxiliary Inversion in Questions

Question 1

Which is the correct yes/no question form of the statement 'She enjoys cooking'?

• A. Enjoys she cooking? — the main verb moves to the front
• B. Does she enjoy cooking? — do-support supplies an auxiliary to invert when none exists
• C. She does enjoy cooking? — the auxiliary stays in its original position
• D. Does she enjoys cooking? — tense is retained on both verbs

Answer: (B)

Simple present tense sentences like 'She enjoys cooking' have no auxiliary verb to invert. English applies do-support: insert 'does' (for third-person singular) and invert it to the front. Crucially, the tense moves to 'does,' so the main verb loses its -s inflection and reverts to the base form 'enjoy.' Option D makes the classic error of keeping tense on both verbs, which is ungrammatical in English.

Question 2

Which is the correct yes/no question form of 'They have been waiting for an hour'?

• A. Been have they waiting for an hour? — the past participle moves to the front
• B. Have they been waiting for an hour? — the first auxiliary 'have' moves before the subject
• C. Do they have been waiting for an hour? — do-support is always required in English questions
• D. They have been waiting for an hour? — rising intonation alone makes the question

Answer: (B)

When there is already an auxiliary verb, English inverts it directly with the subject — no do-support needed. The first auxiliary in the verb phrase 'have been waiting' is 'have,' so it moves to the front: 'Have they been waiting?' The rest of the verb phrase ('been waiting') stays in place. Option C incorrectly adds do-support where an auxiliary already exists.

Question 3

In the question 'Does she like pizza?', the word 'does' carries the tense, so the main verb appears in its base form 'like' rather than the inflected 'likes.'

• T. True
• F. False

Answer: True

This is how do-support works: when 'do/does/did' is inserted as a dummy auxiliary, it takes over the tense marking. The main verb can no longer carry tense — it reverts to the bare infinitive (base form). So 'she likes' becomes 'does she like' — the -s shifts from the main verb to the auxiliary. Saying 'Does she likes' keeps tense on both and is ungrammatical.

Question 4

To form the yes/no question from 'He went to the store,' you move 'went' to the front: 'Went he to the store?'

• T. True
• F. False

Answer: False

English does not move main verbs in question formation — it only moves auxiliary verbs. Since 'went' is a main verb (simple past of 'go') with no auxiliary, do-support is required. The correct question is 'Did he go to the store?' — 'did' (past tense 'do') is inserted and inverted, and the main verb reverts from 'went' to its base form 'go.'

Question 5

Why do English yes/no questions require do-support in simple present and past tenses, and what happens to the main verb when do-support is applied?

Model answer: English yes/no questions require an auxiliary verb to invert with the subject. Simple present and past tense sentences (e.g., 'She reads,' 'He left') have no auxiliary — only an inflected main verb. Do-support inserts a dummy auxiliary (do/does for present, did for past) to fulfill the inversion requirement. When this happens, the tense marking shifts entirely to the 'do' form, so the main verb loses its inflection and appears in its base form: 'She reads' → 'Does she read?'; 'He left' → 'Did he leave?'

Do-support is a repair strategy: English needs an auxiliary to invert but doesn't have one in these tenses, so it manufactures one. The important implication is that tense cannot appear twice in the same verb phrase — once 'does' or 'did' takes it, the main verb must be bare. This is why 'Does she reads?' is ungrammatical even though 'She reads' is perfectly fine.