In past times tense, the verb “do” variations to “did” for all subjects. However, “does” stays unchanged while in the 3rd-person singular current tense. Below are a few illustrations: These helping verbs let for the indicator of steps or states of staying without the repetition of the leading verb. https://socialeweb.com/story5867730/the-basic-principles-of-does-proleviate-help-with-shoulder-pain