2018中考英语知识点：从属连词用法
2017-08-29 14:35:52中考网编辑
新一轮中考复习备考周期正式开始，中考网为各位初三考生整理了各学科的复习攻略，主要包括中考必考点、中考常考知识点、各科复习方法、考试答题技巧等内容，帮助各位考生梳理知识脉络，理清做题思路，希望各位考生可以在考试中取得优异成绩！下面是《2018中考英语知识点：从属连词用法》，仅供参考！
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.
