1 一、 时间状语从句主句从句从句，主句1
as soon as “一 ⋯就 ⋯”2
倒装情况： no sooner had sb
done⋯ than ⋯ didHardly had sb
done⋯ when⋯ did⋯Scarcely had sb
done⋯ when⋯ did⋯主句过去完成时，从句一般过去时3
When 一个时间点，一段时间同时或先后While 强调某一段时间内，同时发生，进行时搭配
对比As 短暂动作或同时发生，一边⋯一边,主从同时时态：主将从现（动作还没发生）主将来时从句现在完成时（强调动作做完）4
When 和 while 也可是连词引导并列句：when 表这时这时候Was/were about to do⋯Was/were going to do
Was/were on one’ s way⋯Was/were on the point of doing⋯刚好做某事，这时when⋯ “这时 ”Was/were doing⋯ 正好做某事，这时表同时Had done 做完了某事，这时2 5
⋯ while⋯ （“然而 ”反比 ）6
Before 引导的时间状语从句“还没等 ”（谓语不用否定式）“⋯之后 )才/就”固定句型it will (not)be some time before ⋯ do ⋯It was (not)some time before ⋯ did
（肯 /否）不久就要 it wont’ be long before ⋯ do⋯ 不就才 ⋯ it wasn’ t long before ⋯ do ⋯7
until/till (till 不用于句首或强调句 )引导时间状语从句⋯ not ⋯ until/till⋯ 直到 ⋯才主句谓语是终止性动词用否定式⋯ until/till ⋯直到 ⋯为止⋯ 主句谓语动词是延续性动词用肯定式i
