320. Найдите ошибку в каждом предложении и исправьте её.

1. He is going to visit the British Museum next week.
2. I think it is going to happen.
3. I'll fly to London next Sunday. Here is my ticket.
4. What are your plans? Will you come tomorrow?
5. We don't have any butter. - OK. I'm going to buy some butter.
6. I am going to speak to them tomorrow.
7. What are you going to tell them?
8. I am sure he is coming tomorrow.