---English has a large vocabulary,hasn't it?
7个回答

因为这是一固定句子结构即 祈使句+ and+ 简单句,所以构成祈使句是由动词原形开头,所以用know.副县长不定式可现在分词.那样and失去了意义.如果把句子改为下面形式就不同了.

Knowing more words and expressions ,you will find it easier to read and communicate.