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.