2. 状语从句
（1）时间状语从句：在一个句子中作时间状语的句子。
时间状语的连接词：when while as after before as soon as since till /until by the time依然是连接词后加陈述语序。
举例：when当的时候
Mozart started writing music when he was four years old.
（2）缘由状语从句：在一个句子中作缘由状语的句子。
连接词：由连词because, since, as引导, 也可由for, now that 等词引导。
举例：I didnt go to school yesterday because I was ill.
（3）条件状语从句：在一个句子中作条件状语的句子。
连接词：if假如, unless 除非。
举例：If it doesnt rain tomorrow, we will go hiking.
（4）目的、结果状语从句
目的状语从句是指在一个句子中充当目的状语的句子。
结果状语从句是指在一个句子中充当结果状语的句子
目的状语从句连接词so that, sothat , in order that 引导。
结果状语从句连接词 sothat, suchthat, so much/manythat引导。
举例：sothat 这样以至于
The scientists report was so instructive that we were all very excited.
（5）让步状语从句
让步状语从句是指在句子中作让步的状语的句子
连接词：though, although.，whetheror not
举例：Although he is rich, yet he is not happy.
3.no matter从句
结构：no matter +特殊疑问词疑问词+陈述语序 或特殊疑问词+后缀ever+陈述语序
如：No matter what happened, he would not mind.
注意：no matter 不可以引导主语从句和宾语从句。
