按要求改写句子。1. Are you going to have a birthday cake？（作肯定回答）_2. Mums going to make a birthday cake for me.（变一般疑问句3. They are going to have lunch together. (改为一般疑问句并作否定回答)-4. Come to her party.（变否定句）_5. We are going to have a picnic tomorrow. (改成一般疑问句，并作肯定回答)_6. My friend is going to make a present for me. (改为一般疑问句，并作否定回答)_7. Whose book is it? (回答 Amy的)_8. It is hers. (用pen改写句子)_9. He is very sad. (改为一般疑问句，并作肯定回答)_10. We will go to the park next week. (改为一般疑问句，并作否定回答)_11. I am Lingling. （对划线部分提问）_12. Tom can speak English.（变成否定句）_13. I can swim in the river. (变成一般疑问句)_14. Can you ride a bike? (作肯定回答)_15. She can jump high. （变成过去时）_16. There is a picture on the wall. （变成复数形式的句子）_17.There are some boxes in the room.(变为单数句子)_