Найти ошибки и исправить предложения.

1. I couldn't have spoken English when I was at school, but now I'm very fluent.

2. It must to have been you that Frankie was talking about.

3. He must have to do it. There was nobody else there.

4. It can't be Louis who told you. He didn't know about it.

5. Ypu should told him the whole story. He needed toy know.