1. How about waiting for the bus
2. Having bought some food, Mary went home.
3. He finds it interesting to watch this film.
Có j sai mong thông cảm vì tôi ngu TA
 

1/ Why don't we wait for the bus? -> How about waiting for the bus instead?
2/ Before Mary went home, she had bought some food (perfect participle). -> Prior to going home, Mary had already purchased some food. 3/ It is interesting for him to watch this film. -> He finds watching this film interesting.