Present participle; Past participle - responding - responded Present - respond - respond - responds - respond - respond - respond Past - responded - responded - responded - responded - responded - responded Future - will respond - will respond - will respond - will respond - will respond - will respond Present conditional - would respond - would respond - would respond - would respond - would respond - would respond Present Perfect - have responded - have responded - has responded - have responded - have responded - have responded Past Perfect - had responded - had responded - had responded - had responded - had responded - had responded Future Perfect - will have responded - will have responded - will have responded - will have responded - will have responded - will have responded Past conditional - would have responded - would have responded - would have responded - would have responded - would have responded - would have responded Imperative - - - respond - - - - - - - -