*turn in
(1)睡觉
e.g. I turned in late last night. (=went to bed)
(2)turn sb. in 把（某人）交给警方，使自首
e.g. He turned the thief in just now. 他刚把贼交给警察。
(3)turn sth. in 退还，交还；上交，提交
e.g. You must turn in your pass when you leave the building.
I haven’t even turned in Monday’s work yet.
*turn on上学路上电影
(1)打开（电器之类的）
e.g. Turn on the radio, plea.
(2)产生或使产生兴趣、兴奋。通常与 to 连 用
快递停了吗
e.g. My uncle turned me on to jazz.
(3)突然攻击，袭击
e.g. His normally placid dog turned on him and bit him in the leg.
*turn down
(1)把热度，音量等降低
e.g. Plea turn down the radio, it ’s noisy.
(2)拒绝某人
e.g. I applied for the job but they turned me down.
*turn out
(1) 关上，关掉（灯）
e.g. She 荡寇风云票房turned out the light. (2)（因为重要的事件而）聚集
e.g. Crowds of fans turned out at the airport to welcome their idol.
(3)生产，制造（某物）
e.g. The factory turns out 300 cars a day.
公共卫生基础知识
(4)turn sb. out 迫使（某人）离开，赶走
e.g. I turned the dog out becau he was disgusting.
(5)turn out to be 结果是，证明是
e.g. All the thing he said turned out to be untrue. 或者可以用从句： It turned 鼻子歪面相out that he was lying.
*turn over
(1)turn sth. over 翻身，翻转
e.g. If you turn the box over, you'll e some words at the bottom of it.
(2)to think about sth. 考虑某事
e.g. I kept turning the idea over in my mind. 我一直在考虑这个主意。
路桥十里长街(3)把某物移交某人
e.g. I turned东芝电脑 the key over to the head teacher. 我把钥匙交给班主任。
(4)把某人交给警方
观赏螺
He turned the robber over just now.
(和刚才 turn in 一样)
*turn to
(1)turn to sb. / sth. 求助于某人或某物
e.g. He turned to his best friend for help.
(2)turn to sth. 开始做某事
e.g. Some young people turn to crime.
(3)（把书）翻到
他刚才把强盗交给了警察。
一些年轻人开始走上犯罪之路。
