I saw few people.

7)双重否定

You can‘t make something out of nothing.

What‘s done cannot be undone.

There is no sweet without sweat.

No gain without pains.

I can‘t help/keep/laughing whenever I hear it.

No man is so old but(that)he can learn.

8)排除否定

Everyone is ready except you.

He did nothing but play.

But for your help,I couldn‘t do it.

9)加强否定

I won‘t do it at all.

I can‘t see it any more.

He is no longer a boy