2022中考英语从属连词分类
大致可分为三大类：
1、名从里的从属连词
that (无词义，不做成分)
if，whether (表达是不是的意义，但不做句子成分)
2、状从里的从属连词，before，after，since，if，because，though等。
从属连词使用方法
在英语词类中，连接词可说是最易学会的一种。
从结构上说，英语连接词分两大类：并列连词(coordinating conjunctions)和从属连词(subordinating conjunctions)。
并列连词连接两个或两个以上地位平等的字、词组或分句。比如：
(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。比如：
(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。如动词是持续性动词，它要用一定句，如：I studied hard until 12 oclock last night.假如动词是瞬间截止性动词，则要用否定句，如:He didnt 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引导的时间状语一般是动作的结束时间，如：I had learned 25 English songs by the end of last term.
