general rule

add NOT (or N'T) to the auxiliary
I am waiting John is driving they are travelling I have asked she has answered you have been trying we have been listening Helen will leave we will / we'll arrive	I am not* waiting* John isn't driving they aren't travelling I haven't asked she hasn't answered you haven't been trying we haven't been listening Helen will not* / won't leave* we will not* / won't arrive*

if there is no auxiliary: use the auxiliary DO + infinitive
I like doughnuts she speaks Spanish they read novels I bought doughnuts Sarah spoke French we worked hard	I don't* like doughnuts* she doesn't* speak Spanish* they don't* read novels* I didn't* buy doughnuts* Sarah didn't* speak French* we didn't* work hard*

We always use an auxiliary
when we make a sentence or verb negative or interrogative,
not the main verb !

If there is no auxiliary in the sentence
add the auxliary DO (+ infinitive)