turn用作动词和名词，不仅意义较多，也有很多常用短语。现梳理如下。
1.turn做动词
1）turn用作动词指“转动，旋转，翻转”。比如：The wheels of the car began to turn. 汽车的轮子开始转动起来。She turned the wheel sharply to the left.她猛地向左打方向盘I can't get the screw to turn.我拧不动这个螺丝钉。
2）turn指“转身，(使)转向”。比如：I turned and headed for home.我转身朝家走去。She turned to look at me.她转过头看着我。He turned back to his work.他回去继续工作。I turned away and looked out of the window.我扭过脸去望着窗外。
3）turn指“翻动（书页）。比如：Please turn to page 10.请翻到 10 页。He sat turning the pages idly.他坐在那里无所事事地翻着书。
4）turn指“（使）变成，成为”。比如：The leaves are turning brown in autumn.秋天叶子变黄。The weather has turned cold.天气变得寒冷了。
2.turn作名词指“转而，反过来”。比如：Theory is based on practice and in turn serves practice.理论基于实践，反过来又服务于实践。
3.常用短语
1）turn down拒绝；关小，降低。比如：Why did she turn down your invitation? 她为什么谢绝你的邀请？Turn down the music. It's too loud.关小音乐，太吵了。
2）turn in交还，上交。比如：He must turn in his uniform when he leaves the army.离开部队时他必须交还军服。
3）turn off 拐弯；关上。比如：They turned off into another street.他们拐到了另外一条街。Turn off the light when you leave the classroom.离开教室时关灯。
4）turn on 开，打开。比如：Turn on the TV please.请打开电视。
5）turn out结果是，(最后)证明是；制造，生产。比如：It may not turn out to be the best thing to do.这可能不是最好的做法。This factory turns out various kinds of agricultural implements.这家工厂生产各种农具。
6）turn into变成，是变成。比如：The caterpillar turned into a butterfly.毛毛虫变成了蝴蝶。
7）turn up出现，来到。比如：Tom didn't turn up at the meeting.汤姆没到会。
8）take turns 依次，轮流。比如：We three took turns driving on the way to Hanan.在去海南的路上我们三个人轮流开车。We need to take turns to talk.我们需要轮流讲话。
9）in turn 依次地，轮流地。比如：There were cheers for each of the women as they spoke in turn.女士们依次发言时，每一位都得到了喝彩。
