Present participle; Past participle - convulsing - convulsed Present - convulse - convulse - convulses - convulse - convulse - convulse Past - convulsed - convulsed - convulsed - convulsed - convulsed - convulsed Future - will convulse - will convulse - will convulse - will convulse - will convulse - will convulse Present conditional - would convulse - would convulse - would convulse - would convulse - would convulse - would convulse Present Perfect - have convulsed - have convulsed - has convulsed - have convulsed - have convulsed - have convulsed Past Perfect - had convulsed - had convulsed - had convulsed - had convulsed - had convulsed - had convulsed Future Perfect - will have convulsed - will have convulsed - will have convulsed - will have convulsed - will have convulsed - will have convulsed Past conditional - would have convulsed - would have convulsed - would have convulsed - would have convulsed - would have convulsed - would have convulsed Imperative - - - convulse - - - - - - - -