第十九讲 连词 （三）

这是一份第十九讲 连词 （三），共17页。
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引导时间状语从句的从属连词：
* when “当...时候”, 从句用一般过去时，主句过去进行时，从句动词可以是延续性也可是非延续性。 Eg: She was ding hmewrk when the bell rang.* while “当...时候”,从句与主句一般皆用进行时态，且从句谓语动词必须为延续性动词。 Eg: My mum was cking while my father was watching TV.
* after “在...之后”,表示主句的动作发生在从句的动作之后。 Eg: Yu can watch TV after yu read a bk.* befre “在...之前”,表示主句的动作发生在从句的动作之前。 Eg: Yu must wash yur hand befre yu have dinner.* until/till “直到...”，常与nt连用，构成 “直到...才” Eg: I didn’t g t bed until my mum came back.
* since “自...以来”,主句用现在完成时，从句用一般过去时。Eg: I have learnt English since I was eight years ld.* as sn as “一...就”，引导的从句常用一般现在时，主句用一般将来时。Eg: I will call yu as sn as I arrive there.
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引导条件状语从句的从属连词：
* if “如果”,引导的条件状语从句需遵循“主将从现”原则，即主句用一般将来时，从句用一般现在时。Eg: He will attend the meeting if it is fine tmrrw.* unless “除非；如果不”,unless可以转化为“”结构，主从句的时态与if引导的条件状语从句一致。Eg: Yu will frget it unless yu use it.* as sn as “只要”,引导的条件状语从句同if引导的一致。Eg: As sn as yu study hard, yu will pass the exam.
引导让步状语从句的从属连词：
* thugh “尽管”Eg: I had t g t wrk thugh it rained heavily.* althugh “尽管”,可与thugh互换。Eg: Althugh it rained heavily, I had t g t wrk.* even thugh/if “即使”Eg: Even thugh/if I have enugh time, I dn’t want t g there with him.注意： 引导让步状语从句时，不能与but同时使用。
引导原因状语从句的从属连词：
* because “因为”,回答用why引导的问句，不能和s同时使用。Eg: -- Why were yu late fr schl tday? --Because I gt up late.* since “既然”,语气比because弱，表示对方已知的原因。Eg: Since he says s, it must be true.* as “由于；因为”,语气比since弱。as引导的从句与主句具有同等的重要性。Eg: Mther began t wrry abut my brther as it was getting dark.
引导结果状语从句的从属连词：
* “如此...以至于”,s后面需跟形容词或副词。Eg: This by is s yung that he can’t dress himself.
* “如此...以至于...”such后面需跟名词。Eg: He is such a yung by that he can’t dress himself.
引导目的状语从句的从属连词：
* s that “以便于”* in rder that “为了” 二者可进行互换。Eg: I get up early s that I can catch the first bus. = I get up early in rder that I can catch the first bus