7初中语法系列连词.ppt
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连词;;5. and: “和”在肯定句中表并列
or: “和”在否定句中表并列
另外:1)or “或者”用于选择疑问句
2)or “否则”
eg. ①.Which do you like better, tea or milk?
②.Hurry up, or you’ll be late for school.
6.but “但是”表转折
eg. I listened, but I heard nothing.
注意:1)though(虽然), but(但是)不能连用
2)not … but 不是…而是
eg. This book isn’t mine but yours.; both….and ….两者…都;既….又…; 连接并列主语时用复数。注意: both….and ….用在否定句中表示部分否定。
例:He can’t play both the violin and the piano.他并非既会演奏小提琴,又会演奏钢琴。
neither…nor: 既不…也不 连接两主语,就近原则
7. either…or: 或者…或者…;连接两主语,就近原则。Either you and he is wrong.
either….or…在否定句中表示部分否定,不是….就是…; Either you or I am not right.不是你不对,就是我不对。
not only … but also:不但…而且…; 连接主语时,就近原则。Not only you but also your mother is kind.;not only…but also…可以和as well as 互换。例:She is not only beautiful but also kind.= She is kind as well as beautiful.她不但漂亮,而且心地很好。
Both he and I are students.
Neither he nor I am a student.
引导宾语从句的连词:
1 that引导的宾语从句:表示陈述意义的宾语从句,从句由陈述句转化来,这时从句和主句时态一致。另一类特征是从句的主句谓语动词多是hope, think; find; be sure等。
The teacher said ( that ) they would have a test next week. I think ( that) you can help me.
;2if和whether引导由一般疑问句转变成的宾语从句。If和whether引导宾语从句可互换。If 一般用于口语,whether用较正式或书面语中。
“Do you know John?” he asked me.= He asked me if/whether I knew John.
但在下列情况中只能用whether而不能用if.
与or not连用时
I don’t know whether I should go or not.
在介词后作宾语时。
I am thinking about whether you can swim.;与动词不定式连用时。
I don’t know whether to go.
在主语从句,表语从句和同位语从句中。
The problem is it is true or not.
在动词discuss引导的宾语从句中。
They are discussing whether they will have a class meeting.
3 wh-疑问词引导的宾语从句。
Can you tell me how I can get to the post office?
引导时间状语从句的连词。Do you know what time he left for Shanghai last night.
引导时间状语从句的从属连词:when; while; as; after; before; since; till/until; as soon as等。
l;when表示当…..的时候,指的是一点或一段时间。如:When I arrive there, I will call you。我到那里后,我会给你打电话。
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