时间副词分句由从属连词 when, since, before, after, while, as soon as 等引导。例如：
● Give me a call when you are free.
● Jim had done his homework before he went to class.
● As soon as the speaker entered the auditorium, the audience clapped.
原因副词分句由从属连词 because, since, as 等引导。例如：
● Helen got the job because she was the most suitable candidate.
● As he was tired, he went to bed early.
条件副词分句由从属连词 if, unless 等引导。例如：
● If you try hard, you are sure to improve.
● We will leave as planned unless we are informed otherwise.
让步副词分句由从属连词 though, although 等引导。例如：
● Though David was not well, he came to work as usual.
● I enjoy walking although I do not go out as much as I used to.
地点副词分句由从属连词 where, wherever 等引导。例如：
● Where there is oppression, there is resistance.
● In today's world, you can go wherever you want.
目的副词分句由从属连词 so that, in order that 等引导。例如：
● Please speak louder, so that all can hear you.
● The students work hard in order that they can pass.
结果副词分句由从属连词 so……that, such……that 等引导。例如：
● The weather is so hot that I don't like to go out of doors.
● China is such a large country that it takes time to make it a fully developed nation.
方式副词分句由从属连词 as, just as……so 等引导。例如：
● We will do as we are told.
● Just as men sow, so will they reap.
比较副词分句由从属连词 as, than 等引导。例如：
● Dick is as smart as you （are）.
● We know you better than he does.
这里有几点要注意。第一、当副词分句在句首出现时，要用逗号和主句隔开。第二、习惯上，先出现的分句的主语要用名词，后出现的用代词，如：
Before John went out, he locked the door.
第三、有些副词分句可以在句首，就最好把它们放在句首，主句在后。这样可以使人更注意主句中的内容，达到较好的传讯效益。例如：
a. Tom was absent as he was ill.
b. As Tom was ill, he was absent.
a. The boys ran home when it rained.
b. When it rained, the boys ran home.
a. You will do well if you surge ahead.
b. If you surge ahead, you will do well.
a. Betty did not get the job though she was interviewed.
b. Though Betty was interviewed, she did not get the job.
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