1. Please don't ask me that question
I’d rather you didn’t ask me that question
I haven't seen Bob since I was in Ho Chi Minh city.
3. Jonh only undertood very little what the teacher said
Jonh could hardly understand what the teacher said.
4. Tom will be twenty next week
It's Tom's twentieth birthday next week.
5. She is fond of her nephew although he behaves terribly
She is found of her nephew in spite of his terrible hehaviour.