英语状语从句中的择比句before的用法

Question

如题所述

Answer 1

　　before引导的状语从句
1. 引导时间状语从句时具体用法before 所引导的时间状语从句 所表示的动作 发生在主句动作之后 如果强调主句的动作发生在前 主句谓语 要用过去完成时 before 引导的从句用一般过去时 如不强调动作的先后 主句和从句 均用一般过去时 如 she worked in shsnghai before she came here.she had studied english for six years before she went to college 另外注意 before 所引导的时间状语从句 常表示 .之后 才.如果主句 是一般将来时 从句用一般现在时 如 it won't be long before we meet.again 不久我们就会再见面

2.　尤其要注意“it+be+一段时间+before…”这一句型。如：

　　1. The field research will take Joan and Paul about five months; it will be
a long time ______ we meet them again. (安徽卷)

　　A. after B. before C. since D. when

　　2. He was told that it would be at least three more months ______ he could
recover and return to work. (江西卷)

　　A. when B. before C. since D. that

　　【解析】两道题均before。第1题涉及的句式为：It will be a long time
before…，意思是“要过很久才会……”;第2题涉及的句式为：it was some time
before…，意思是“在……之前过了一段时间”，通常可转译为“要过一段时间才会……”。