将下列句子改为否定句和一般疑问句并作肯定和否定回答。
1、Liu Tao is going to USA next month.
2、I will try my best to win the match.
3、There will be a singing contest tomorrow afternoon.
4、My father is going to buy a bike.
5、They are going to do some shopping tomorrow morning.
6、We will meet at six tomorrow evening.
7、I'll join them.
8、It is going to snow.
9、We are going to have a birthday party for Lily.
10、I will help you with your Maths.
11、My friends are going to see me this evening.
