Negatives with auxiliary verbs
Definition
Most English clauses become negative by placing not after an auxiliary verb. If a present-simple or past-simple clause has no auxiliary, English adds do, does or did and returns the main verb to its base form.
Examples
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She does not work here.
Does carries present tense and not makes the clause negative.
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They were not ready.
A form of be takes not directly; no form of do is needed.
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You cannot enter without a pass.
The modal can combines with not before the base verb.
Positive clause vs. negative clause
Mina speaks French.
The present-tense ending appears on the main verb.
Mina does not speak French.
Does carries the tense, so the main verb returns to speak.
In present-simple and past-simple negatives, do-support carries tense and agreement while not follows the auxiliary.
The position of not affects what is denied
Clause negation usually denies the proposition as a whole, but context and stress can narrow the contrast. Other negative words such as never, nobody and nothing can also make a clause negative without not.
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I did not say that Leo broke the vase.
The basic structure negates say, while context can clarify which part of the message is being rejected.
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Nobody answered the phone.
Nobody already gives the clause negative meaning, so another negative auxiliary is not needed.
Common mistakes
She doesn't works here.
She doesn't work here.
After doesn't, use the base form work.
I don't know nothing.
I don't know anything.
In standard English, avoid combining not with another negative word when only one negative meaning is intended.
Quick check
Question 1 of 3
Which present-simple negative is correct?
With he, use does not followed by the base form live.Which sentence correctly negates a clause with be?
A form of be takes not directly: is not.Which sentence has one standard negative meaning?
Nobody already makes the clause negative, so no additional not is needed.Nice work — you've completed the quick check.
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