Present participle; Past participle - gassing - gassed Present - gas - gas - gases - gas - gas - gas Past - gassed - gassed - gassed - gassed - gassed - gassed Future - will gas - will gas - will gas - will gas - will gas - will gas Present conditional - would gas - would gas - would gas - would gas - would gas - would gas Present Perfect - have gassed - have gassed - has gassed - have gassed - have gassed - have gassed Past Perfect - had gassed - had gassed - had gassed - had gassed - had gassed - had gassed Future Perfect - will have gassed - will have gassed - will have gassed - will have gassed - will have gassed - will have gassed Past conditional - would have gassed - would have gassed - would have gassed - would have gassed - would have gassed - would have gassed Imperative - - - gas - - - - - - - -