Present participle; Past participle - sweltering - sweltered Present - swelter - swelter - swelters - swelter - swelter - swelter Past - sweltered - sweltered - sweltered - sweltered - sweltered - sweltered Future - will swelter - will swelter - will swelter - will swelter - will swelter - will swelter Present conditional - would swelter - would swelter - would swelter - would swelter - would swelter - would swelter Present Perfect - have sweltered - have sweltered - has sweltered - have sweltered - have sweltered - have sweltered Past Perfect - had sweltered - had sweltered - had sweltered - had sweltered - had sweltered - had sweltered Future Perfect - will have sweltered - will have sweltered - will have sweltered - will have sweltered - will have sweltered - will have sweltered Past conditional - would have sweltered - would have sweltered - would have sweltered - would have sweltered - would have sweltered - would have sweltered Imperative - - - swelter - - - - - - - -