do: Base/infinitive; employed for current tense other than with third man or woman singular subjects (aside from the singular they ‘Do’ and ‘Does’ may also emphasize the validity and assertion of statements. This is especially helpful in responses to uncertainties or when a person must affirm an expression emphatically. https://livebackpage.com/story5808575/does-proleviate-help-with-shoulder-pain-an-overview