重要

before

🇬🇧/bɪˈfɔː(r)/ 🇺🇸/bɪˈfɔːr/📚 706 83 5中考高考
If something happens before a particular date, time, or event, it happens earlier than that date, time, or event. 在 (某日、某时、某事件) 以前

preposition [位置和方向](时间上)在…之前,早于;在(某个钟点)之前;(次序)在…之前;当面,在…面前;由…考虑中;面对(法院,法庭或其他官方机构)并受审;比…更重要;(位置)在…前面;(未来将发生的事)等待着,面临着;(宁可…而)不愿…;在…影响下,在…威慑下

If you do one thing before doing something else, you do it earlier than the other thing.
在 (做某事) 之前 •  He spent his early life in Sri Lanka before moving to Canada.

conjunction [推进连词]在…以前;到…为止;以免,不然;(先)…才…;(宁可…而)不愿

Stock prices have climbed close to the peak they'd registered before the stock market crashed in 1987.
股票价格已经快爬升到了1987年股市崩溃前的最高纪录。

adverb [时间副词]以前,过去;在(某时间或某事)以前;在前面

You use before when you are talking about time. For example, if something happened the day before a particular date or event, it happened during the previous day. (
某时、某事) 以前

be- 构成动词,表示"使…成为";构成一些介词before prep. 在前面(be+fore 前面)
before 出现在下面的课文中
Lesson 071&72 He’s awful!
Lesson 075&76 Uncomfortable shoes
Lesson 141&142 Sally’s first train ride
Lesson 4 An exciting trip
Lesson 23 A new house
Lesson 32 Shopping made easy
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