By the time he was fourteen,Einstein had learned advanced mathematics all by himself.(从句为一般过去时,主句要用过去完成时)
5.几组固定形式
1)It will be+一段时间+before...多久之后才……
2)It is+一段时间+since...自从……以来已有多长时间了。
3)be about to do...when...;be doing...when...;on the point of doing...when...
It will be two days before he returns.
It is three years since I came here.
I was doing my homework when my cousin came.
考点三 结果状语从句
其常用句型:
so+形容词/副词+that从句
so+形容词+a/an+单数可数名词+that从句
so+many/much/little(少)/few+名词+that从句such+a/an+形容词+单数可数名词+that从句
such+形容词+复数可数名词/不可数名词+that从句He is so young that he can not go to school.
It is such fine weather that we all want to go out for a walk.
考点四 because,since,as和now that1.because为常用词,且说明的是直接原因,并可回答why引导的问句。
2.as,since和now that语气较弱,常用来表示一些显而易见或对方知道的原因。since译为“既然,鉴于”时不可用as替换。
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