1
before + noun/pronoun/gerund
介词结构，后接名词、代词或动名词。
She left before the meeting.
她在会议之前离开了。
在...之前
先理解核心含义，再看它在真实句子里的用法。
在...之前
earlier in time than something else
She left before the meeting.
她在会议之前离开了。
早于(时间上)
Earlier than (in time).
在空间上位于前面
In front of in space.
在面前
In the presence of.
在(某人)的考虑、判断、权威之下
Under consideration, judgment, authority of (someone).
I always take a shower before breakfast.
我总是在早餐前洗澡。
She studied English before she moved to London.
她在搬到伦敦之前学了英语。
I have never been to Beijing before.
我以前从未去过北京。
介词结构，后接名词、代词或动名词。
She left before the meeting.
她在会议之前离开了。
连词引导时间状语从句。
Finish your homework before you watch TV.
在看电视之前完成你的作业。
副词，常位于句末，多与完成时连用。
I have seen this movie before.
我以前看过这部电影。
Not this
I met him two days before.
Use this
I met him two days ago.
中文说'两天前'，但英语中'before'通常不单独与时间段连用表示'多久以前'，应用'ago'。'before'需要结合具体时间点或从句使用。
Not this
There is a tree before the house.
Use this
There is a tree in front of the house.
中文'在...之前'可指时间或空间，但英语中表示空间位置'在...前面'应用'in front of'，'before'主要用于时间顺序。
Not this
I will not leave before you come.
Use this
I will not leave until you come.
否定句中表示'直到...才'应用'until'，'before'在肯定句中表示'在...之前'，但此处否定式搭配'until'更自然且符合英语习惯。
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表示时间上的先后关系
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.