[典例剖析]按要求完成句子。
1. The old man is fishing by the river. (改为复数句)
The old ________ ________ fishing by the river.
2. Mrs White is looking for her car key in the parking lot. (对画线部分提问)
________ ________ Mrs White ________ for in the parking lot?
3. I'm running with my classmates on the track. (改为否定句)
________ ________ ________ with my classmates on the track.

1. The old man is fishing by the river. (改为复数句)
The old ________ ________ fishing by the river.
2. Mrs White is looking for her car key in the parking lot. (对画线部分提问)
________ ________ Mrs White ________ for in the parking lot?
3. I'm running with my classmates on the track. (改为否定句)
________ ________ ________ with my classmates on the track.
答案