be good for用什么be动词

be good for 值得，对...有好处

用哪个be动词要看主语是单数还是复数，单数用is，复数用are。

例句:Doing exercise everyday is good for me to keep healthy. 这里doing exercise就代表单数。

be与情态动词的连用 其用法为：情态动词+系动词be原形。

Oh， great! That'll be good for Fergus.