Present participle; Past participle - unbuttoning - unbuttoned Present - unbutton - unbutton - unbuttons - unbutton - unbutton - unbutton Past - unbuttoned - unbuttoned - unbuttoned - unbuttoned - unbuttoned - unbuttoned Future - will unbutton - will unbutton - will unbutton - will unbutton - will unbutton - will unbutton Present conditional - would unbutton - would unbutton - would unbutton - would unbutton - would unbutton - would unbutton Present Perfect - have unbuttoned - have unbuttoned - has unbuttoned - have unbuttoned - have unbuttoned - have unbuttoned Past Perfect - had unbuttoned - had unbuttoned - had unbuttoned - had unbuttoned - had unbuttoned - had unbuttoned Future Perfect - will have unbuttoned - will have unbuttoned - will have unbuttoned - will have unbuttoned - will have unbuttoned - will have unbuttoned Past conditional - would have unbuttoned - would have unbuttoned - would have unbuttoned - would have unbuttoned - would have unbuttoned - would have unbuttoned Imperative - - - unbutton - - - - - - - -