要了解上下句子之间的是逻辑关系来确定关联词的意义；其次要确定哪句是主句，哪句为从句，如：

　　【句型1】主句 ＋ when (while, as, before, after) ＋ 从句

　　【典型例句】

　　I took care of my little brother while Mother was away.

　　妈妈不在家，我照顾小弟弟。

　　He had finished his homework before I got home.

　　我回到家之前，他已经做完了家庭作业。

　　My brother learned English after he had entered the college.

　　我弟弟在考入大学后学的英语。

　　【句型2】主句 ＋ until / till＋从句

　　【典型例句】

　　He stayed up until / till it was four next morning.

　　他熬夜一直熬到第二天凌晨4点。

　　He did not go home until / till he finished his work.

　　他一直把工作做完之后才回家。

　　He read and read until / till it was dark.

　　他读着读着，一直读到天黑。

　　把下面两个简单句合成一个复合句

　　1. He took notes. He was listening to the teacher.

　　________________________________________________________________________

　　2. I started home. I received the letter.

　　________________________________________________________________________

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