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《Grammar》精品PPT课件优质课下载
when , whenever , while , as ,
before , after ,till (until ) , since , once , as soon as 等.
除此之外还有可以由 every time , by the time ;
the first time ; the moment (instant , minute,) ,
Nosooner…than…;
hardly(scarcely)… when …;
immediately, directly; on +doing;
at + 名词 等 引导.
状语从句(the adverbial clauses
Eg: Mother was worried because little
Alice was ill , especially ______ Father
was away in France .
A . as B . that C. during D. if
题干中需要引导时间状语从句的从句从属联词,故A 为正确答案, as 在此等于when /while .
as , when , while 当… …时的区别.
在引导时间较长的“背景”时,可通用.
As (when, while ) I was walking down the street , I met Li Ming.
As means
①at the same time that… 两个动作或事件同时发生.
They talked as they walked.
As I worked , someone came near.
as ②可以说明两 种正在变化或发生的情况.
As I get older , I get more optimistic (乐观的).
③ 主、从句中 都是终止性动词时, as = when ,
He came just as (when ) I reached the door.