1.We often see him __play___(play) on the ground.
变被动句: He is often seen to play on the ground by us.
2.Listen!We hear her _singing__(sing) a song.
变被动句: Listen! She is heard singing a song.
3.使某人做某事 （分别用 make、 let、 have、 get ）
make sb. do sth. / let sb. do sth. / have sb. do sth. / get sb. to do sth.
使某事被做 （ make 、 have）
make sth. done. / have sth. done
4. 对我们来说学好英语很重要的
It's very important for us to learn English well.
5 There was a fire in the office yesterday. Later_____all the people were saved.
希望能够帮到你,祝你学习进步!