for+时间段 ，since+时间点 ，by+将来的时间 ,lately；recently, just，up to now, till now, so far, these days， in the past few years／months／weeks／days ，yesterday；last week；in 1945，at that time；once；during the war；before；a few days ago；when，used to+动词原形，be／become／get used to+动名词doing，before，after,by,up till ，will do.will be doing, have been doing
时间状语从句常由when,while,as,since,after,before,until/till,as soon as等连词引导
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