It may give rise to a host of problems.

问题描述:

It may give rise to a host of problems.
give rise to 是动词词组,It主语,第三人称单数应是gives rise to才对?
或者may后面本来应加动词原形?

是的.May是情态动词,后面必须加动词原形
看来你不了解情态动词啊.看看这个吧