Present participle; Past participle - treading - trod Present - tread - tread - treads - tread - tread - tread Past - trod - trod - trod - trod - trod - trod Future - will tread - will tread - will tread - will tread - will tread - will tread Present conditional - would tread - would tread - would tread - would tread - would tread - would tread Present Perfect - have trod - have trod - has trod - have trod - have trod - have trod Past Perfect - had trod - had trod - had trod - had trod - had trod - had trod Future Perfect - will have trod - will have trod - will have trod - will have trod - will have trod - will have trod Past conditional - would have trod - would have trod - would have trod - would have trod - would have trod - would have trod Imperative - - - tread - - - - - - - -