并列成分，强调三项或以上并列，最后二项之间要用并列连词and. 表示并列项结束。
I like watching TV and I like swimming .
I like watching TV,my brother likes swimming and my sister likes playing badminton
Reading books ，swimming in the river and playing badminton are my love
但语言的更高层次追求简洁明白的表达。我们需要从and连词表并列过渡到———加逗号的并列。
《新编高级英语语法》(p.515) 也提到无连词并列：某些谚语也是采取无连词并列句的形式表达条件句的内容。例如:
Easy come, easy go.(＝ If money comes easily， it will go easily.) (来得易，去得快。)
Grasp all, lose all. (＝ If you try to grasp everything， you will get nothing.) (样样都要，全部失掉。)
逗号就表示意犹未尽，后面还有未提及的内容。所以逗号可以连接并列项。尤其是在谚语，诗歌，小说中。
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