Does is the third person singular form of do, which can be used as both a verb and a noun. Doess Not is a negative form of doe, which is used to deny substantive verbs in the third person. The tense is the simple present tense, but the prototype of the verb was added later.

Usage and examples of doing and not doing:

1. As a behavioral verb, like other verbs, it means "doing" and so on.

She usually does her homework in the afternoon. She usually does her homework in the afternoon.

He does his homework at night. He does his homework at night.

2. As an auxiliary verb, it helps the active word to form negation and doubt.

He doesn't like apples. He doesn't like apples.

Does he like bananas? Does he like bananas?

3.doesn't as an auxiliary verb, followed by the prototype of the verb, constitutes the negative sentence of the general present tense in the sentence.

He doesn't do his homework at night. He doesn't do his homework at night.