一.句子：to turn in
二.含义：give sth to sb上交、归还、上床睡觉
三.对话：
A: Did you turn in the assignment?
B: Yes! Now I'm free.
A: So, what are you gonna do?
B: I'm gonna turn in early tonight. I'm tired~
四.扩展：
1.turn down 拒绝（提议或者请求）、调低（音量或热度）
His proposal was unreasonable, So I turned him down.
It's a little bit hot. Please turn down the air-conditioning.

2.turn against不喜欢、不赞成，变成和...敌对
She tried to turn her husband against her mother-in-law.

3.turn away 转过脸去、不让（某人）进入

4.turn into (使)变成、成为、转变为、译为
He has to turn this essay into chinese.他不得不把这篇文章译为中文
Caterpillar turn into butterflies.毛毛虫变成蝴蝶

5.turn off 关闭、关上、拐弯、转入另一条路
Please turn off the TV
We need to turn off the highaway at the next exit.我们需要在下个出口出高速公路

6.turn on打开、取决于
He turned on the tap and then washed his hands.
His achievements turn on his efforts.他的成就取决于他的努力

7.turn out熄灭、证明是、出动、到场、培养出
8.turn over 换台、翻阅、翻过（一页）、仔细考虑、营业额为
9t.urn to 求助于
10.turn up 到场、突然出现、开大（空调等）

Thank coach shane