1. 语法讲解：
复合句的灵活应用
复合句由一个主句和一个或一个以上的从句构成。主句是全句的主体，通常可以单独存在；从句则是一个句子成分，不能独立存在，常见的从句及从句引导词主要有：
定语从句：who，which，that，whom, whose, where, when, why
宾语从句：that, where, what，why
让步状语从句：though, although, even if, even though
原因状语从句：because, as, for，since
条件状ift从句：I suppose, supposing, provided, so long as
时间状i許从句：until, after, before，as soon as
结果状语从句：so…that…, such…that…
目的状语从句：so that，in order that
比较状语从句：(not) so…as…, (not) as…as…
同位语从句：that，when，where，what
2. After he had put it on the floor, he promptly went to sleep again.
他把床塾往地板上一放，很快又睡着了。
知识点：本句after引导时间状语从句。
3. A gust of wind swept the bed off the roof and sent it crashing into the courtyard below.
一阵大风把床从屋顶上刮了下来，把它摔碎在下面的院子皇
知识点1：sweep sth. off somewhere 把某物从某处刮下来
知识点2：crashing into the courtyard below是现在分词作宾语it的补足语。
