1. If your father don't have time to come to school, please call me.
2. If so, you will have to invite all of your friends to come to the party.
3. If it doesn't rain tomorrow, we'll give the show in the park.
4. There will be no maths lessons this Friday, aren't there?
5. If your brother doesn't need any help, he won't come here.
1. None of his friends speaks good English.
2. We are planning to visit that museum tomorrow.
3.What are the interesting places in Yixing?
4. There is not much pollution in the countryside.
5. I hope you won't come to join us.