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2.从属连词 状语从句 时间连词 after，as，before，once，since，till，until，when，while，as soon as，whenever，the moment，the first time 地点连词 where，wherever 方式连词 as，as if，as though 原因连词 considering(that)，now(that)，because，since，as，seeing that 状语从句 结果连词 so that，so...that，such...that，in such a way that，with the result that 目的连词 so that，in order that，in case(that)，lest(that)，for fear that 条件连词 if，unless，as(so)long as，on condition(that)，supposing(that)，provided/providing(that) 让步连词 though，although，even if/even though，no matter...，however，whatever，while 比较连词 as，than，as...as...，not so...as，when，while 1. when，while，as作连词的用法比较 when 当……时候(既可指时间点，也可指时间段) Don’t get excited when you talk. (正在)……突然 I was about to go out when it rained. 既然，尽管，虽然(常放在句中) How can he get the promotion when his boss dislikes him？ 用在表示“一……就……”的句型中 scarcely/hardly...when... Hardly had I entered my room when the telephone rang. while 当……时候(只指时间段) While we were talking，the teacher came in. 然而，表示对比转折 He is strong while his brother is weak. 虽然，尽管(常放在句首) While I have sympathy for them，I think they went too far. as | 
