before有哪些用法？
before的全部时态用法，整理如下：
Before作为单个副词，也就是说，当单独使用时，经常用于现在完成时，也可以用于过去时。Before时态连词“before”表示主句和从句的动作顺序。过去完成时可以用在主句或从句中，意思相同。
例如: Before he entered the institute,he had served in the army.在他进入研究所之前，他曾在军队服役。
如果before子句使用简单过去时，主子句可以使用简单过去时或过去完成时，具有相同的含义。
例如：The concert had started before we got to the hall.在我们到达大厅之前，音乐会已经开始了。
一、用作介词，注意以下用法：
1、表示时间，意为“在…以前”，其后只能接点时间或具有点时间意义的其他名词，而不能接一段时间。如：I'll be back before fiveo'clock。我5点前回来。
2、表示在两者中选择其一，意为“宁可…而不愿…”。如：They would die before surrendering. 他们宁死而决不投降。
二、用作前置时间连词的状语从句
除了表达“before …”的基本意思外，还有以下用法值得注意:
1、表示“宁可。也不愿”。如They would die before surrendering.他们宁死不屈。
2、表示"不到…就”"还没有…就”。如：Before the week was out,they were dead.那个星期还没过完他们就死了。
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