do: Foundation/infinitive; employed for present tense except with third human being singular subjects (aside from the singular they ‘Do’ and ‘Does’ also can emphasize the validity and assertion of statements. This is especially practical in responses to doubts or when just one really should affirm an expression emphatically. Using https://thefairlist.com/story10590224/the-smart-trick-of-does-proleviate-help-with-shoulder-pain-that-no-one-is-discussing