Prior to now tense, the verb “do” variations to “did” for all subjects. However, “does” stays unchanged in the third-man or woman singular existing tense. Here are several illustrations: These helping verbs let for the indicator of actions or states of staying without the repetition of the main verb. https://gregorybwoex.bloggip.com/38024653/a-review-of-does-proleviate-help-with-shoulder-pain