Present participle; Past participle - retrograding - retrograded Present - retrograde - retrograde - retrogrades - retrograde - retrograde - retrograde Past - retrograded - retrograded - retrograded - retrograded - retrograded - retrograded Future - will retrograde - will retrograde - will retrograde - will retrograde - will retrograde - will retrograde Present conditional - would retrograde - would retrograde - would retrograde - would retrograde - would retrograde - would retrograde Present Perfect - have retrograded - have retrograded - has retrograded - have retrograded - have retrograded - have retrograded Past Perfect - had retrograded - had retrograded - had retrograded - had retrograded - had retrograded - had retrograded Future Perfect - will have retrograded - will have retrograded - will have retrograded - will have retrograded - will have retrograded - will have retrograded Past conditional - would have retrograded - would have retrograded - would have retrograded - would have retrograded - would have retrograded - would have retrograded Imperative - - - retrograde - - - - - - - -