是的，要加原形动词。因为doesn't是助动词，英语中情态动词或助动词不能独立作谓语，必须和它后面的原形动词一起构成谓语。

doesn't相关短语

It doesn't make sense 这没有意义，不合常理

It doesn't matter 不要紧,没关系

it doesn't matter 这事儿无关紧要

doesn't make sense 行不通

It doesn't matter to me 我无所谓

It doesn't matter. 没关系。

No, he doesn't have 不,他没有

it doesn't hurt to ……也无妨，做某事有利

But he doesn't have a radio yet 可是他还没有收音机

She doesn't have your book either 她也没有拿你的书