before

音标发音

• 英式音标 [bɪˈfɔ:(r)]
• 美式音标 [bɪˈfɔr,-ˈfor]
• 国际音标 [bi'fɔ:]
• 英式发音
• 美式发音

基本解释

• prep. 在……之前，先于；在……面前；面对（法院、法庭或其他官方机关）并受审；（宁愿……）不愿
• conj. 在……以前；到……为止；以免，不然；（宁可……而）不愿
• adv. 以前，过去，已经

同根派生

• before

• before相关词

用法辨析

prep. (介词)

• before可用于表示时间。首先，可以表示“先于，在…以前”，其后可以跟表示具体日期、时间等的名词或数词，也可以跟表示时间或动作的名词。其次，可以表示“在做…之前”，后接 v -ing。再次，可以表示“紧接在…之前”。before用于否定句还可表示“直到…为止”。注意before之后只能接表示时间点的名词，而不能接表示时间段的名词。
• before可用于表示动态或静态的位置，意思是“在…之前”，与behind相对。
• before可用于表示顺序或排列上的“在…之前”或“居于…之前”，与after相对。引申可用于表示比较，即在等级、价值、重要性、能力等方面的“在先”“优于”“重于”。再引申则可用于表示对某事物的优先选择，即“宁可”或“与其…宁可”。
• before还可表示“面对，在…眼前，在…面前”“有待于去完成”“在审理中，由…考虑”“在…压力下”等。

conj. (连词)

• before主要引导时间状语从句，意为“先于”“…之后才”“(不多久)就…”。当主句是将来时时，从句谓语动词须用现在时；当主句是一般过去时或过去完成时时，从句常用过去时。before引导的时间状语从句不能用于否定式。
• before还可用于barely〔scarcely〕...before结构，意为“刚…就…”。
• before还可引导让步状语从句，意思是“宁愿…也不…”。
• before引导的从句常用省略句型。

adv. (副词)

• before用作副词时,意思是“以前,在前面”,表示从较近的过去至较远的过去。用作时间状语泛指以前、不与具体时间连用时，谓语动词可以用一般过去时,也可用现在完成时,前者只表示“过去发生过”,后者则强调“对现在有影响”。
• before与具体时间连用时,一般置于其后，谓语动词通常用过去完成时。

• before使用方法
• before详细辨析

英汉例句

用作介词 (prep.)

• The man standing before the blackboard is our English teacher.
  站在黑板前面的那个人是我们的英语老师。

用作连词 (conj.)

• Be a pupil before you become a teacher.
  先做学生,再做老师。

用作副词 (adv.)

• We saw that film before.
  那部电影我们以前看过。

• before更多例句

词组短语

用作介词 (prep.)

动词+～

• appear before 在(某时)之前出现;出庭
• carry before 迅速获胜,势如破竹
• come before 在…之上,比…重要;被交由…处理；被提交…考虑
• complain before 控诉
• go before 居先；走在前面

• before更多词组

英英字典

剑桥英英字典

• at or during a time earlier than (the thing mentioned)
• in front of

柯林斯英英字典

• If something happens before a particular date, time, or event, it happens earlier than that date, time, or event.
• Before is also a conjunction.
• If you do one thing before doing something else, you do it earlier than the other thing.
• Before is also a conjunction.
• 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.
• Before is also a preposition.
• Before is also a conjunction.
• If you do something before someone else can do something, you do it when they have not yet done it.
• If someone has done something before, they have done it on a previous occasion. If someone has not done something before, they have never done it.
• If there is a period of time or if several things are done before something happens, it takes that amount of time or effort for this thing to happen.
• If a particular situation has to happen before something else happens, this situation must happen or exist in order for the other thing to happen.
• If someone is before something, they are in front of it.
• If you tell someone that one place is a certain distance before another, you mean that they will come to the first place first.
• If you appear or come before an official person or group, you go there and answer questions.
• If something happens before a particular person or group, it is seen by or happens while this person or this group is present.
• If you have something such as a trip, a task, or a stage of your life before you, you must do it or live through it in the future.
• When you want to say that one person or thing is more important than another, you can say that they come before the other person or thing.
• before long&rarrsee long

• before剑桥字典
• before柯林斯字典