In the past tense, the verb “do” variations to “did” for all subjects. Alternatively, “does” stays unchanged while in the 3rd-human being singular existing tense. Here are some examples: “Do” is actually a useful and adaptable verb, but it has its limitations—prevent using it with modal verbs as well https://bookmark-search.com/story20315611/a-review-of-does-proleviate-help-with-shoulder-pain