stop to do停下来去做另一件事 I stop to have a rest. She stops to listen to the teacher. She stopped to talk. We stop to have dinner. They stop to play a game. stop doing停止正在做的事 we stopped talking when the teacher came in. Stop playing !Let's begin our class. Stop smoking!It's forbidden. stop playing games.you'd better do your homework first. I stopped riding when I met a friend.
