1. You'd better not go out at night.
2.I'm quite sure that they've already got back home.
3.I don't think you'll have to stay in Taizhou.(否定前移)
4.Can you tell me what has happened to him?
6.I've been to Beijing for many times.(for也可以省略)
7.Have you already seen this film?
8.She has just come to our school and she is a new teacher.
9.My brother has gone to New York,can you come here again in a few days?
10.I bought this dictionary yesterday.