Present participle; Past participle - preheating - preheated Present - preheat - preheat - preheats - preheat - preheat - preheat Past - preheated - preheated - preheated - preheated - preheated - preheated Future - will preheat - will preheat - will preheat - will preheat - will preheat - will preheat Present conditional - would preheat - would preheat - would preheat - would preheat - would preheat - would preheat Present Perfect - have preheated - have preheated - has preheated - have preheated - have preheated - have preheated Past Perfect - had preheated - had preheated - had preheated - had preheated - had preheated - had preheated Future Perfect - will have preheated - will have preheated - will have preheated - will have preheated - will have preheated - will have preheated Past conditional - would have preheated - would have preheated - would have preheated - would have preheated - would have preheated - would have preheated Imperative - - - preheat - - - - - - - -