Present participle; Past participle - obsessing - obsessed Present - obsess - obsess - obsesses - obsess - obsess - obsess Past - obsessed - obsessed - obsessed - obsessed - obsessed - obsessed Future - will obsess - will obsess - will obsess - will obsess - will obsess - will obsess Present conditional - would obsess - would obsess - would obsess - would obsess - would obsess - would obsess Present Perfect - have obsessed - have obsessed - has obsessed - have obsessed - have obsessed - have obsessed Past Perfect - had obsessed - had obsessed - had obsessed - had obsessed - had obsessed - had obsessed Future Perfect - will have obsessed - will have obsessed - will have obsessed - will have obsessed - will have obsessed - will have obsessed Past conditional - would have obsessed - would have obsessed - would have obsessed - would have obsessed - would have obsessed - would have obsessed Imperative - - - obsess - - - - - - - -