1
sth falls in
在此用法中，主语常为建筑物或结构物。
The old building fell in during the storm.
那座旧建筑在暴风雨中倒塌了。
倒塌；塌陷
fell in — past of fall in · irregular form
先理解核心含义，再看它在真实句子里的用法。
倒塌；塌陷
to fall down or collapse inward
The old building fell in during the storm.
那座旧建筑在暴风雨中倒塌了。
多指屋顶、天花板等向内坍塌。
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可生成：动词变形 Verb forms。只有点击后才会开始生成。
向内倒塌；塌陷
To collapse inwards.
士兵列队；站队；入列
Of a soldier, to get into position in a rank.
结束；终止；失效。
To come to an end; to terminate; to lapse.
开始生效。
To become operative.
The roof of the old barn fell in during the storm.
暴风雨期间，那座旧谷仓的屋顶塌了下来。
The ceiling was falling in around us, so we ran outside.
天花板在我们周围塌落下来，所以我们跑到了外面。
If the supports break, the whole tunnel might fall in.
如果支撑断裂，整条隧道可能会塌陷。
在此用法中，主语常为建筑物或结构物。
The old building fell in during the storm.
那座旧建筑在暴风雨中倒塌了。
常用在军事或队列场景中。
The soldiers were ordered to fall in.
士兵们被命令集合列队。
表示同意或支持某人或某事。
I don't agree with all his ideas, but I'll fall in with the plan.
我并非同意他所有的想法，但我会同意这个计划。
Not this
The teacher fell in the students.
Use this
The teacher told the students to fall in.
“fall in”表示“集合、列队”时为不及物动词短语，不能直接跟宾语。中文“集合学生”是及物结构，但英语中需用使役结构。
Not this
The picture fell in from the wall.
Use this
The picture fell off the wall.
“fall in”特指内部坍塌或倒塌，不用于物体从垂直表面脱落。表示“从墙上掉下”应使用“fall off”。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use fell in naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.