Basic Negatives
Learn how not is added to deny a statement, how do, does and did are used when needed, and how words such as some and any change in a negative sentence.
Denying a statement
A basic negative shows that something is not true.
A basic negative denies a statement. In English, this is most often done by placing not directly after an auxiliary verb.
In the sentence She does not agree with the plan., the auxiliary verb does carries the negation, and the main verb agree returns to its base form, exactly as it would in a yes/no question.
Negative sentences are also commonly shortened into contractions, such as doesn’t, in everyday speech and writing.
Before you begin
Basic negatives are one of three negative patterns.
This lesson focuses on basic negatives specifically. Negatives as a whole include two other patterns, each covered in its own lesson.
If you would like an overview of how negation works in general, begin with the Negatives page.
The central idea
Adding not is often enough to reverse a statement’s meaning.
Compare a positive statement with the same statement made negative.
01
Positive
She agrees with the plan.
02
Negative
She does not agree with the plan.
The useful question is: is there already an auxiliary verb to attach not to?
Here, the statement has no auxiliary verb of its own, so does is added specifically to carry the negation, and the main verb loses its -s ending.
When an auxiliary verb is already present
Not follows the existing auxiliary verb.
With be
She is not ready.
With have, used as an auxiliary
They have not finished.
With a modal verb
He cannot swim.
Cannot is usually written as one word, unlike other modal negatives.
When there is no auxiliary verb
Do, does or did is added to carry the negation.
Present simple: do not or does not
She does not agree.
Does is used with a singular subject; do is used with a plural subject or I and you.
Past simple: did not
She did not agree.
The main verb returns to its base form
She agrees. → She does not agree.
Once do, does or did carries the negation and the tense, the main verb no longer needs its own ending.
Negative contractions
Not is often shortened and attached to the auxiliary verb.
is not → isn’t
does not → doesn’t
did not → didn’t
have not → haven’t
cannot → can’t
will not → won’t
Will not is irregular
Unlike most contractions, will not becomes won’t rather than a form that simply removes letters from will.
Some and any
Some usually changes to any in a negative sentence.
Positive: some
I have some time this afternoon.
Negative: any
I do not have any time this afternoon.
Any, rather than some, is the standard choice in a negative sentence.
A useful decision guide
Ask whether an auxiliary verb is already there.
01
Does the statement already have an auxiliary verb?
If so, place not directly after it.
02
If not, what tense is the main verb in?
Present simple takes do/does not; past simple takes did not.
03
Does the sentence contain some?
Check whether it should switch to any.
04
Would a contraction fit the tone?
Contractions are common in speech and everyday writing.
Common mistakes
A negative sentence needs exactly one auxiliary verb carrying not.
Do or does is not added when an auxiliary verb already exists.
Not: She doesn’t can swim.
Correct: She can’t swim.
The modal verb can already carries the negation; a second auxiliary is not needed.
The main verb keeps its base form after do support.
Not: She doesn’t agrees.
Correct: She doesn’t agree.
Doesn’t already carries the present tense, so the main verb does not take its own -s ending.
Some is generally replaced by any in a negative sentence.
Not: I don’t have some time.
Correct: I don’t have any time.
Check your understanding
Which word correctly completes each negative sentence?
Choose the correct answer for each sentence.
Which sentence is correctly formed?
✅ Exactly! Doesn’t already carries the present tense, so the main verb stays in its base form.
❎ Not quite. Check the ending of the main verb after doesn’t.
Does the main verb need its own -s ending here?
We don’t have __________ milk left.
✅ Exactly! Any is the standard choice in a negative sentence.
❎ Not quite. Check whether the sentence is positive or negative.
Look at the word “don’t” earlier in the sentence.
Which sentence correctly negates the modal verb?
✅ Exactly! Can already carries the negation once not is attached.
❎ Not quite. A modal verb does not need a second auxiliary verb added to it.
Is can already an auxiliary verb on its own?
Choose the best explanation
Select the sentence that explains the negative correctly.
Why is “She doesn’t can swim.” not correctly formed?
✅ Exactly! A sentence needs only one auxiliary verb carrying the negation.
❎ Not quite. Look at how many auxiliary verbs appear in the sentence.
Why does “I don’t have some time.” need to be corrected?
✅ Exactly! In a negative sentence, any is the standard choice.
❎ Not quite. Compare this sentence to the positive version, which uses “some” correctly.
Try it another way
Complete each negative sentence.
Type the missing word.
✅ Exactly! Will not becomes the irregular contraction won’t.
❎ Not quite. This contraction does not simply remove letters from “will”.
✅ Exactly! Didn’t is the contraction of did not.
❎ Not quite. Think about the contraction used for the past simple negative.
Quick review
Not attaches to an auxiliary verb, existing or added.
A basic negative denies a statement, usually by placing not after an auxiliary verb.
If the statement already has an auxiliary verb, such as be, have, or a modal verb, not follows it directly.
If there is no other auxiliary verb, do, does or did is added, and the main verb returns to its base form.
Some generally changes to any in a negative sentence.
Negative contractions, such as doesn’t and the irregular won’t, are common in speech and everyday writing.
Remember
Find the auxiliary verb first, then attach not to it.
If a statement already has an auxiliary verb, add not directly after it. If it does not, add do, does or did, and let the main verb return to its base form.