Turn in 可以表示把作业交去批改，主要见于美式英语；也可以在非正式对话中表示上床睡觉。前一种用于作业、报告和申请表，后一种是在说准备休息：I think I'll turn in。
想在对话中用 turn in 吗？
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turn in + homework/report/form (AmE; BrE hand in); turn it in; turn in (= go to bed) + early/for the night
- Please turn in your lab reports by Friday at noon.
- I'm exhausted after the hike, so I think I'll turn in early.
- Did you turn in the application form, or is it still on your desk?
修改原因
修改前I have to pass my essay to the professor by Friday.
修改后I have to turn in my essay to the professor by Friday.
Pass 可以与考试搭配：pass an exam 是通过考试。但把作业交给老师批改，应说 turn in an essay。Pass my essay to the professor 更像实际把纸递给教授，因此修改用 turn in 替换 pass。
英式英语中，提交作业通常说 hand in：Hand in your essays on Monday。Turn in 的这层意思更偏美式，但英国人也能理解。表示睡觉时，turn in 属于轻松的口语，中性说法是 go to bed。
动手练习
It's almost midnight and I have an early flight, so I'm going to ___ now.
查看答案
turn in — 快到午夜，第二天还要赶早班飞机，所以是准备睡觉，选 turn in。Turn off 表示关闭某物或从道路上拐出去，不表示上床睡觉。
给老师写一条消息，说明无法按时交作业。用 turn in 说清是哪份作业，并提出新的提交时间。
I'm sorry, but I won't be able to turn in my history essay until Thursday morning.
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