一个主语多个谓语是单句，复合句是句子作了主语，宾语，表语，定语，状语等，例如：
He likes basketball and often plays basketball with his classmates after school. 他喜欢篮球，而且经常在放学后和同学一起打篮球（本句有两个谓语动词，是简单句）
I know that he likes basketball and that he often plays basketball with his classmatesafterclass. . 我知道他喜欢篮球而且经常在放学后和同学一起打篮球（本句中，know后面是宾语，是由that 引导的从句充当的，所以是复合句）
一个主语多个谓语并列 这个句子仍然是简单句
