Present participle; Past participle - clenching - clenched Present - clench - clench - clenches - clench - clench - clench Past - clenched - clenched - clenched - clenched - clenched - clenched Future - will clench - will clench - will clench - will clench - will clench - will clench Present conditional - would clench - would clench - would clench - would clench - would clench - would clench Present Perfect - have clenched - have clenched - has clenched - have clenched - have clenched - have clenched Past Perfect - had clenched - had clenched - had clenched - had clenched - had clenched - had clenched Future Perfect - will have clenched - will have clenched - will have clenched - will have clenched - will have clenched - will have clenched Past conditional - would have clenched - would have clenched - would have clenched - would have clenched - would have clenched - would have clenched Imperative - - - clench - - - - - - - -