1、时间状语从句难点闯关熟练运用时间状语从句，需闯过以下四关。一、 捕捉热点连词1. while, when与aswhile意为“当时候”，从句需用持续性动词或状态性动词；而when引导时间状语从句中的动词既可以是持续性动词也可以是短暂性动词；as引导一个持续性动作，多用于指主句和从句动作同时发生。例如：When she arrived in Shanghai, her mother met her at the station.While I was walking along the street I noticed a police car in front of a bank.As he
2、grew older he lost interest in everything except gardening.2. till 与untiltill 与until意思相同，只是till一般不放在句首。应当注意 “It is not until. that.”句型中的强调结构。例如：People dont know the value of health until / till they lose it.It was not until she took off her dark glasses that I realized she was a famous film star.3.
3、before与after after与before 引导的时间状语从句中，由于它们本身能表明时间先后关系，所以谓语动词常用一般时替代完成时。应当注意“It is + 段时间 + before.”，意为“多久之后才”。例如：After the work was done, we sat down to sum up experience.The fire lasted about three hours before the fire fighters could control it.It will be three years before I come back to the univer
4、sity.二、 寻觅时间连词英语中，immediately, directly, instantly, the moment, the minute, the instant可作连词，表示“一就”；every time, each time, any time, the first time, next time作连词，表示“每次，每当，第一次，下次”。例如：Immediately shed gone, the boys started to mess about in the classroom.三、 扫描倒装现象1. Not until位于句首时，主句谓语采用倒装语序。例如：Not unt
5、il I began to work did I realize how much time I had wasted.2. “Hardly / Scarcely. when”，“No sooner. than”意为“一就”，主句用倒装语序。例如：Hardly had they settled in their seats in the theater when the curtain went up.四、 把握时态运用1. 时间状语从句中，用现在时表示将来。例如：Do telephone me as soon as you arrive in Australia.2. since用在表时间从
6、句的句子中，其主句通常使用完成式，从句则用过去式或完成式。但当主句谓语动词是be 或seem时，可以不用完成式。例如：She has been collecting foreign stamps since she was a child.It is almost forty years since the terrible war ended.3. 在“hardly / scarcely. when”和 “no sooner. than”结构中, 主句用过去完成时。例如：We had no sooner reached the top of the hill than we all sat down to rest.
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