until 介词,和tomorrow构成介宾结构,介宾结构作状语
before 连词 后面连接一个句子 引一个表语从句介词 和连词 有没有简单的区分呢？e ..话说，before可能是介词。因为连词引导的结构去掉后主句仍完整，昨非谓语百分之99是介词。连词不可能 连词一般与被连接词的成分是并列的介词一般有介宾结构，介宾是做主，宾或表任何一成分时去掉后主句残缺作状语去掉后主句完整
Will this fish keep until tomorrow?和The best time to make friends is before you need them.
Will this fish keep until tomorrow?和The best time to make friends is before you need them.
until和before 在此分别是 介词 还是 连词?怎么区别?
until和before 在此分别是 介词 还是 连词?怎么区别?
英语人气：805 ℃时间：2019-08-19 12:37:38
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