Can belongs to modal verbs, as well as modal verbs such as should, may and must. , must be followed by the prototype of the verb. The negative form of can is the same, and it must be followed by the verb prototype.

Not is not only the prototype of a verb, but also a noun, for example, I am not a student. (I am not a student) can be added to the participle. For example, you are not telling the truth. You're not telling the truth. You'd better not eat it. You'd better not eat this. You can also add an infinitive (of course, the infinitive to do is also the prototype of the verb. He decided not to go to school.