状语从句课件-2024届高考英语二轮复习

状语从句 一、时间状语从句 1. when的用法 （1）当 … … 时候 (可与持续性、短暂性动词连用,when引导的从句的动作可在主句动作之前/同时发生) Eg: When I lived there, I used to go to the seashore on Sundays When the film ended, the people went back. (短暂性动词：如 start/begin /decide ) （2）突然,就在这时（从句均为一般过去时） was/were doing…when…正在做某事突然 had just done…when…刚刚做了某事突然 was/were about to do…when…刚要做某事突然 was/were on the point of doing...when...刚要做某事突然 2.while的用法 （1）：在… …期间、当… …时候 (从句必须是持续性动词，主句动作和从句动作同时发生) While+主语+be doing: Please don’t talk so loud while others are working. （2）趁着 eg:We must work hard to gain more knowledge while we are young. 3.as的用法 （1）当...时，常与延续性动作连用，从句动作与主句动作同时或者几乎同时发生。 eg:As l was going out, it began to rain. (2)随着 As time goes on, it’s getting warmer and warmer. 4.一...就 (1)as soon as (2)the instant/the moment/the minute/the second (3)immediately/instantly/directly (4)on/upon+doing (5)no sooner...than;hardly/barely/scarcely...when 注意：① no sooner … …(过去完成时)than … …(一般过去时) Hardly/scarcely/barely … …(过去完成时)when … …(一般过去时) ② no sooner, hardly/scarcely/barely 位于句首时，所在的主句倒装 He had no sooner finished his speech than the students started cheering. →No sooner had he finished his speech than the students started cheering. 5. till,until 和 not...until （2）否定句 not......until/till not until 位于句首时句子倒装 (前不倒后倒) (主句的谓语动词必须是非延续性动词) Eg: The film didn’t begin until she arrived. Not until the film began did she arrive. （1）肯定句：until/till” 表示“到……为止”，可以互换， 注意：till不可以置于句首，而until可以 Eg : He remained there until/till she arrived. Until you told me I had no idea of it. 6. before 的用法 （1）在..之前 eg:We had sailed four days and four nights before we saw land. （2）句式： It will (not) be＋一段时间＋before ...从句用现在时 (没有)过……时间才(就)…… eg:It will be half a year before I come back. It won’t be long before we meet again. It was (not) ＋时间段＋before ... 从句用过去时 (没有)过了……(时间)才(就)…… eg:It was three days before he came back. It wasn't two years before he left the country. 7.since的用法 （1）自从，since 后接过去的时间点或一般过去时态的从句时，句子或主句用现在完成时 (现在完成进行时) 。 eg：Great changes