Present participle; Past participle - co-starring - co-starred Present - co-star - co-star - co-stars - co-star - co-star - co-star Past - co-starred - co-starred - co-starred - co-starred - co-starred - co-starred Future - will co-star - will co-star - will co-star - will co-star - will co-star - will co-star Present conditional - would co-star - would co-star - would co-star - would co-star - would co-star - would co-star Present Perfect - have co-starred - have co-starred - has co-starred - have co-starred - have co-starred - have co-starred Past Perfect - had co-starred - had co-starred - had co-starred - had co-starred - had co-starred - had co-starred Future Perfect - will have co-starred - will have co-starred - will have co-starred - will have co-starred - will have co-starred - will have co-starred Past conditional - would have co-starred - would have co-starred - would have co-starred - would have co-starred - would have co-starred - would have co-starred Imperative - - - co-star - - - - - - - -