句型转换。
1. Mr. Li began to teach English in this school in 1999. (同义句转换)
Mr. Li _______ ________ English in this school since 1999.
2. Our monitor has been a League member for two years. (同义句转换)
Our monitor ________ the League two years ago.
3. My grandpa had to collect water from the village well. (改为反意疑问句)
My grandpa had to collect water from the village well, _______ ________?
4. They can hardly believe it. (改为反意疑问句)
They can hardly believe it, _______ _______?
5. He spent hours cleaning out the refrigerator. (同义句转换)
He _______ hours _______ _______ out the refrigerator.
