英语语法.1.（before ）you go any further ,young man ,i think you s

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 19:11:38

英语语法.
1.（before ）you go any further ,young man ,i think you should know the mayor of this city is a good friend of mine .为什么填before
2.什么时候用as什么时候用when,做语法填空时总分不清.
3.they say that they (were require)to study medicine for a long time .为什么不用had require.
1题中before怎样看先后时间顺序。

1.首先从句意上,“你走的更远”是将来的事情,而“你应该知道……”是现在的事情（如果是将来应该用will）,所以前者后发生,所以应该是在你走的更远之前,在……之前,当然用before.
2.注意几点区别就行,时间状语从句中,as表示伴随,主句的动作是延续性的,as引导的从句所述的动作是与之同时的或者说在那个过程中,而时间状语从句中when使用非常广泛,几乎所有的时候都可以用,但强调伴随,“一边……,一边……”时用as较好.
另外,引导定语从句时,when的先行词一定是时间,而as有两种主要用法,一种是在句子开头代表主句整个句子,比如常用的"As is known to us all,……“；另一种是跟such,so搭配,这两种都表示”正像……一样“.
as还可以表示比较显而易见的原因,引导原因状语从句.
其他的特殊用法可能还有,想了解全面还是要看语法书,在自己用心比较,思考.
打字挺累,给分吧.
PS：before在那个句子中是连词,楼上说错了,领一个句子一定是连词

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