3.引导原因状从的有:because (不能与so同时出现在句中)
4.引导时间状语从句的连词:
A. when(当时候),as soon as(一就),notuntil(直到才),after(在之后),引导的主从复合句,主句为一般将来时,从句则用一般现在时来代替一般将来时。 Eg: I won't leave until he comes back.
B. since(自从以来)引导的主从复合句,主句为现在完成时,从句用一般过去时。 Eg:We haven't met each other since she left here last year.
C. while(当时候,一边一边)它引导的时间状语从句常用进行时态。
Eg: My father came in while I was doing my homework.
5.引导条件状语从句的连词: if 如果,引导条件状从,主句用一般将来时,从句则用一般现在时。请区别于if是否相当于 whether,引导宾语从句,时态根据语境确定
eg:1)I don't know if it ____ (rain) tomorrow.
2)If it ______ (rain) tomorrow, I _____________ (not climb) the hills.
3)Joan and Mary haven't seen each other_____they left school five years ago.
A.as B.before C.after D.since
三、 构词法
构词有法记无定法
一、利用构词法记忆:
1.合成法:note+booknotebook,school+yardschoolyard,book+markbookmark
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