含义：为了使语言简洁或避免重复, 省略句中的一个或几个句子成分, 这种语法现象称为______。

省略

Step 2. Analyze & conclude and & but 连接的并列句的省略 观察分析下列句子： 1. Tom picked up a book on the floor and Tom handed it to his teacher. = Tom picked up a book on the floor and handed it to his teacher. 2. Jack must have been playing football and Mary must have been doing her homework. = Jack must have been playing football and Mary doing her homework.