18. You could talk with him on the phone.(改為同義句)

 talk with him on the phone?

17. Lana said to us ,“ I'm happy to see you again. ”(改為間接引語)

Lana us happy to see again.

16. Don't be angry with your son. I think he can do better next time.(改為同義句) 

Don't  your son. I think he can do better next time.

15. You are not as popular as your best friend.(改為同義句) 

Your best friend is than you.

14. I think you should finish your homework first.(改為否定句)

I you finish your homework first.

13. He would like to offer us some help.(改為同義句) 

He would like to some help us.

12. It's time for breakfast.(改為同義句) 

It's time  .

11. Why don't you ask your teacher for help?(改為同義句)

 ask your teacher for help?

10. What's wrong with Joe?(改為同義句) 

What's with Joe?

9. My cousin bought a new bike last week.(改為同義句) 

My cousin has a new bike last week.