Present participle; Past participle - perturbing - perturbed Present - perturb - perturb - perturbs - perturb - perturb - perturb Past - perturbed - perturbed - perturbed - perturbed - perturbed - perturbed Future - will perturb - will perturb - will perturb - will perturb - will perturb - will perturb Present conditional - would perturb - would perturb - would perturb - would perturb - would perturb - would perturb Present Perfect - have perturbed - have perturbed - has perturbed - have perturbed - have perturbed - have perturbed Past Perfect - had perturbed - had perturbed - had perturbed - had perturbed - had perturbed - had perturbed Future Perfect - will have perturbed - will have perturbed - will have perturbed - will have perturbed - will have perturbed - will have perturbed Past conditional - would have perturbed - would have perturbed - would have perturbed - would have perturbed - would have perturbed - would have perturbed Imperative - - - perturb - - - - - - - -