Present participle; Past participle - buttressing - buttressed Present - buttress - buttress - buttresses - buttress - buttress - buttress Past - buttressed - buttressed - buttressed - buttressed - buttressed - buttressed Future - will buttress - will buttress - will buttress - will buttress - will buttress - will buttress Present conditional - would buttress - would buttress - would buttress - would buttress - would buttress - would buttress Present Perfect - have buttressed - have buttressed - has buttressed - have buttressed - have buttressed - have buttressed Past Perfect - had buttressed - had buttressed - had buttressed - had buttressed - had buttressed - had buttressed Future Perfect - will have buttressed - will have buttressed - will have buttressed - will have buttressed - will have buttressed - will have buttressed Past conditional - would have buttressed - would have buttressed - would have buttressed - would have buttressed - would have buttressed - would have buttressed Imperative - - - buttress - - - - - - - -