Present participle; Past participle - bolstering - bolstered Present - bolster - bolster - bolsters - bolster - bolster - bolster Past - bolstered - bolstered - bolstered - bolstered - bolstered - bolstered Future - will bolster - will bolster - will bolster - will bolster - will bolster - will bolster Present conditional - would bolster - would bolster - would bolster - would bolster - would bolster - would bolster Present Perfect - have bolstered - have bolstered - has bolstered - have bolstered - have bolstered - have bolstered Past Perfect - had bolstered - had bolstered - had bolstered - had bolstered - had bolstered - had bolstered Future Perfect - will have bolstered - will have bolstered - will have bolstered - will have bolstered - will have bolstered - will have bolstered Past conditional - would have bolstered - would have bolstered - would have bolstered - would have bolstered - would have bolstered - would have bolstered Imperative - - - bolster - - - - - - - -