Present participle; Past participle - ruining - ruined Present - ruin - ruin - ruins - ruin - ruin - ruin Past - ruined - ruined - ruined - ruined - ruined - ruined Future - will ruin - will ruin - will ruin - will ruin - will ruin - will ruin Present conditional - would ruin - would ruin - would ruin - would ruin - would ruin - would ruin Present Perfect - have ruined - have ruined - has ruined - have ruined - have ruined - have ruined Past Perfect - had ruined - had ruined - had ruined - had ruined - had ruined - had ruined Future Perfect - will have ruined - will have ruined - will have ruined - will have ruined - will have ruined - will have ruined Past conditional - would have ruined - would have ruined - would have ruined - would have ruined - would have ruined - would have ruined Imperative - - - ruin - - - - - - - -