定语从句引导词为that,先行词为复数,引导词后动词单数还是复数?

问题描述:

定语从句引导词为that,先行词为复数,引导词后动词单数还是复数?
原题:He likes movies that ____(be) about scary monster.

复数,跟着先行词走
前提是这个先行词是谓语前的名词原题:He likes movies that ____(be) about scary monster.对吗?用aremovies are about