Doing eye exercises is good for your eyes.

问题描述:

Doing eye exercises is good for your eyes.
这里的exercises做为可数名词,为什么后面用is?

Doing eye exercises 是分词短语作主语,应作单数.请记住:不定式、动名词、分词或其短语,和句子作主语,都应作单数.