状语从句的引导词
状语从句引导词有时间状语从句：when，as，while，the minute, the moment。地点状语从句：where，wherever，anywhere，everywhere。原因状语从句：because，since, as，seeing that，now that，in that，considering that，given that。
一、时间状语从句。
常用引导词：when(在…时), as(当…时), while(在…期间), before(在…之前), after(在...之后), since(自从...以来) , not...until(直到…才)until/till(直到…时)等。
特殊引导词：the minute, the moment, the second, every time, the day，the instant( 瞬间，顷刻), immediately , directly(不久，立即), no sooner … than(一...就...), hardly …when(刚一...就...) , scarcely … when(刚...就.../一...就...),as soon as(一…就…)。
当用no sooner … than，hardly …when，scarcely … when作为引导词的时候，从句要部分倒装。
二、地点状语从句。
常用引导词：where
特殊引导词：wherever, anywhere, everywhere
地点状语从句一般由连接副词where, wherever等引导，已经形成了固定的句型。
三、原因状语从句。
常用引导词：because, since, as。
特殊引导词：seeing that, now that, in that, considering that, given that。
其他类状语从句：
一、目的状语从句。
常用引导词：so that, in order that。
特殊引导词：lest, in case, for fear that，in the hope that, for the purpose of , to the end that。
二、结果状语从句。
常用引导词：so … that, such …
that, so that...特殊引导词：such that, to the degree that, to the extent that, to such a degree that。
三、条件状语从句。
常用引导词：if, unless,whether(whether...or not)
特殊引导词：as/so long as, only if, providing/provided that, supposing that, in case(美语中表条件，英语中表目的), on condition that
四、让步状语从句。
常用引导词：though, although, even if, even though
特殊引导词： as(用在让步状语从句中必须要倒装)，while ( 一般用在句首 )，no matter …， in spite of the fact that, whatever, whoever, wherever, whenever, however, whichever
五、比较状语从句。
常用引导词：as(同级比较), than(不同程度的比较)
特殊引导词：the more … the more …(越来...越...) ; just as …， so…; A is to B what/as X is to Y; no … more than; not so much A as B,the 比较级 ,the 比较级。
六、方式状语从句。
常用引导词：as, as if
特殊引导词：the way
七、状语从句的省略。
状语从句同时具备下列两个条件:①主句和从句的主语一致，或从句主语为it;②从句主要动词是be的某种形式。从句中的主语和be动词常可省略。
