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初二英语知识点:从属连词用法

来源:101教育网整理 2018-12-07 字体大小: 分享到:

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  从属连词用法:

  从结构上说,英语连接词分两大类:并列连词和从属连词。

  并列连词连接两个或两个以上地位平等的字、词组或分句。例如:

  (1) Air and water are indispensable to me.

  (2) She likes going out with friends or playing outdoor games.

  (3) Most workers have a good income, so they look very happy.

  从属连词连接两个或两个以上的分句,形成复杂句中的从属分句。例如:

  (4) He said that he did not want to go .

  (5) Many things have happened since I last saw him.

  (6) You may come if you want to.

  从属连词用来连接各种从句。

  until(till)直到,在用until表达时间状语的句子中,主句中的动词是要十分小心去选择的。

  如动词是持续行动词,它要用肯定句,如:

  I studied hard until 12 o'clock last night.

  如果动词是瞬间截止性动词,则要用否定句,如:

  He didn't go to bed until his mother came back.

  由since,for,by,before, 来引导的时间状语从句。

  since 引导的时间状语是动作的开始时间,如:

  I have studied English since 1990.

  而by引导的时间状语通常是动作的结束时间,如:

  I had learned 25 English songs by the end of last term.


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