使役动词 make、let、have 表示"使、让"，后接动词不定式时省略 to。口诀：三让 make、let、have，后接动词省 to；被动语态 to 回来，let 除外无所谓。
顺口溜记忆
- 三使役 make、let、have，后接动词省 to
- make sb. do 表迫使，have sb. do 表让某人做
- 被动语态 to 回来，make/have 后 to 还原
- let 特殊不用 to，let sb. do 原形到底
- make sb. do 变被动，be made to do 记心间
要点讲解
- make sb. do sth.：The teacher made us clean the classroom. 老师让我们打扫教室。
- have sb. do sth.：I'll have him repair the bike. 我会让他修自行车。
- let sb. do sth.：Let me help you. 让我帮你。
- 被动语态：We were made to clean the classroom. 我们被迫打扫教室。（to 还原）
- have sth. done：让某事被做：I had my hair cut. 我理发了。
例句解析
- Don't make the baby cry. 别让婴儿哭。
- Let's have a rest. 我们休息一下吧。
- He was made to work long hours. 他被迫长时间工作。
- She had her bike repaired yesterday. 她昨天让人修了自行车。
易错提醒
- 主动语态省略 to，被动语态还原 to（make/have）；let 的被动较少见，考试主要考 make。