Which is the correct way to negate the sentence 'He left early'?
AHe left not early
BHe not left early
CHe did not leave early
DHe didn't left early
Option C is correct. 'Left' is a simple past verb with no overt auxiliary, so do-support is required: 'did' carries the past tense and 'leave' reverts to its base form. Option A ('He left not early') is archaic and non-standard. Option B ('He not left early') is ungrammatical — 'not' cannot appear before the main verb. Option D uses the contraction correctly but keeps 'left' in past form instead of reverting to the base form 'leave' — a very common learner error.
Question 2 Multiple Choice
In 'She does not walk,' where has the tense information gone compared to the affirmative 'She walks'?
AThe tense is lost — 'walk' has no tense marker in its base form
BThe tense remains on the main verb 'walk'
CThe tense has moved from the main verb to the auxiliary 'does'
DThe tense is expressed jointly by both 'does' and 'walk' together
The tense moves to the auxiliary 'does,' which carries both the third-person singular agreement and the present tense. The main verb 'walk' reverts to its uninflected base form. This is why do-support feels like the verb 'loses' its tense — it hasn't disappeared; it has relocated. Understanding this transfer is key to forming negatives correctly across all simple tenses.
Question 3 True / False
To negate 'She sings nearly every day,' you should insert 'not' directly after the main verb to get 'She sings not most days.'
TTrue
FFalse
Answer: False
This construction is archaic and non-standard in modern English. Modern negation requires an auxiliary before 'not.' Since 'sings' has no auxiliary in the affirmative form, you must use do-support: 'She does not sing every day.' The main verb also reverts to its base form 'sing.' Inserting 'not' directly after the main verb was possible in Early Modern English but sounds unnatural and is avoided in contemporary usage.
Question 4 True / False
When do-support is used to negate a simple past sentence, the auxiliary 'did' absorbs the past tense and the main verb reverts to its base form — so 'He went' becomes 'He did not go,' not 'He did not went.'
TTrue
FFalse
Answer: True
Exactly right. 'Did' carries the past tense, and the main verb returns to its base form: 'He did not go.' Errors like 'He didn't went' are common precisely because learners try to mark tense on both the auxiliary and the main verb. But in English, tense is marked only once — on the first auxiliary. Once 'did' is present, the main verb must be in its uninflected base form.
Question 5 Short Answer
Why does English require inserting a form of 'do' to negate simple present and simple past sentences, when sentences with existing auxiliaries (like 'She was walking' or 'They have finished') don't need it?
Think about your answer, then reveal below.
Model answer: English negation works by placing 'not' after the first auxiliary verb. Simple present and simple past sentences have no overt auxiliary in their affirmative forms ('She walks,' 'He left'), so there is no site for 'not' to attach to. 'Do' is inserted as a dummy auxiliary — it carries the tense and agreement so that 'not' has a grammatical position. Sentences with existing auxiliaries already provide that attachment site, so no insertion is needed.
This is the principle of 'do-support.' It reflects a fundamental feature of English syntax: negation must attach to an auxiliary. When none is present, the language supplies one. The 'do' doesn't add lexical meaning — it is a purely grammatical placeholder carrying tense. Once you see 'do' as a carrier of tense rather than a meaningful verb, the entire negation system becomes predictable and consistent.