连词的用法。
一概念连接单词，短语，句子或从句的一种虚词。不能独立做成分，二种类并列连词和从属连词。
三并列连词
1 表并列或顺承关系的词“和and”。 study hard ,and you will succeed.
2 表示转转关系的词，“but但是”,while而，yet然而，however可是。
he is clever but lazy. some people like apples while others dislike them .
he is tired yet he works on .the watch is old;however,it works well.
3表示选择或转折关系，or 或者，否则。
hurry up, or you will be late.
4表示因果关系，for/so因为/所以，用来解释或补充说明，表示原因或理由，不能位于句首。it must h**e rained during the night,for the ground is wet.
it was late,so we wet home.
连词短语 neither…nor 两者都不，neither you nor he goes to the park.
either…or 或者…或者…either you or he goes shopping .
not only … but also...不但…而且…
not only did he make a promise,but also he kept it.
not only you but also he likes playing the soccer.谓语就近原则
both…and 两者都…both you and he go to school.
as well as 和，不但…而且…he can speak french as well as english.
他不但会说英语也会说法语。
whether…or 无论……还是…you can go to singapore whether in spring or in autumn.
not...but...不是…而是…he is not tired but weak.
在否定句中，用and，和or的区别。
1列举成分是主语，又在否定词从前，用and连接，当列举成分在否定词之后时，用or构成完全否定。my mother and father can't swim。
i can’t sing or dance.
2在否定句中，如果连接的两部分都有否定词，那么用and连接，否则用or. there is no air and no water on the moon.
there isn’t food or water in the fridge.
3在否定句中，without之后若有列举成分，则用 and，构成完全否定，在肯定句中，without之后要用and连接并列成分。
man can’t live without water and air.=man will die without water or air.
4. they do not h**e time to study and do house,too.他们没有时间既学习又做家务（否前肯后）don’t drink and drive.
不要酒后驾车。
you can’t eat a cake and h**e it.鱼和熊掌不能兼得。
四从属连词。
1引导时间状语从句的连词when，当…什么时候，从句用一般过去时，主句用过去进行时，主句用一般将来时，从句用一般现在时。
he was watching tv when i came home. i’ll call you when i get home.
while 引导的从句必须用延续性动词，且用进行时态。
while i was doing my homework,my mother was cooking.
until 到…为止，he does his homework until 5:00pm.
not...until直到…才he didn’t go home until he finished his homework.
since 自从…用于现在完成时态中，he has had the book since last year.
as soon as 一…就…主将从现=the minute，he will call me as soon as he gets home.
as 一边…一边强调两个动作同时发生，they sang as they walked.
2引导条件状语从句的词。
unless如果不，除非，可以转化为if…not…结构，主从句时态和if一致，unless you study hard,you will fail the exam.=study hard,or you will fail the exam.
if 如果，引导条件状语从句，时态是“主将从现”。或主句含情态动词。
as long as =so long as 只要，当从句的谓语是be,且主从句的主语相同，从句则省略主语和be动词you will succeed as long as hard-working.
3引导让步状语从句
though /although /eve though /if,尽管，虽然，即使，引导让步状语从句时，这些词不能与but连用，但可以与yet，和still连用。
although he is tired,yet he goes on working.
whenever =no matter when无论何whatever =no matter what无论什么。
4 引导目的状语从句，so that 以便（后面句中常含有情态动词），=in order that,后面接句子，in order to+词组 “为了”he studied hard so that (=in order that) he can pass the exam.=he studied hard in order to pass the exam.
5 引导原因状语从句。
because因为，回答why引导的问句。指的是直接原因。
he didn’t come to school because he was ill.
since 既然，语气比because弱，表示众所周知的原因。
since he is ill,you take his place.
as由于，因为，语气比since弱，表示原因对方已知，一般放在主句之前。as he has no car,he can’t get to school easily.
6引导结果状语从句，so...that...such...
that...so that,so+adj./adv.
+that...so +adj./adv.
+a/an+可数名词复数，so+many/much/little/few+名词。
such+a/an+adj.+单数名词+that，such+adj.+名词复数或不可数名词+that
so that +从句（不含情态动词）jim is very tired so that he has to rest.
吉姆很累，所以他不得不休息。
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