1. This is the book I bought yesterday. 2. He is the teacher who teaches me math . 3. The old woman who is sitting under the tree is my grandmother. 4. the book he bought yesterday cost him 50 pounds. 5. Since I was born, I have been in Shanghai. 6. He has been away for the farm for 9 years. 7. He has been to Shanghai for five times. 8. She has learned English for more than 4 years. 9. So far, he hasn't finished the work yet.
求采纳