1, have to, can't, can't, can't, can't, can't.

2. No, no, no, no, no, no, no, it's impossible.

3. No ... No ... No ... No ... No, you have to do this.

There are four main forms of double negation.

One is the use of two negative adverbs, such as: not that I don't want to; I have to do this.

One is a negative adverb plus a negative verb, for example, everywhere.

The other is a negative adverb (or a verb with negative meaning) with rhetorical questions. He has no reason not to answer the phone.

Another is to explain a prerequisite for exclusion first, and then use negative adverbs to explain the previous conditions.

In these four sentence patterns, negative adverbs with rhetorical mood (or verbs with negative meaning) all have the function of strengthening mood. For example, "Isn't the person who dares to do this a hero?" (Visiting ancient Inner Mongolia) means "hero", but the tone is stronger, emphasizing that those who dare to do it are "great heroes".