not…but后面怎么接动词

1. "Will it happen again?"— 'I hope not. but you never know.'

“这事还会再发生吗?”——“但愿不会，但谁知道呢。”

2. She could not but congratulate him.

她只能祝贺他。

3. He is extremely strong — not but that he will catch cold at times.