Present participle; Past participle - undergoing - undergone Present - undergo - undergo - undergoes - undergo - undergo - undergo Past - underwent - underwent - underwent - underwent - underwent - underwent Future - will undergo - will undergo - will undergo - will undergo - will undergo - will undergo Present conditional - would undergo - would undergo - would undergo - would undergo - would undergo - would undergo Present Perfect - have undergone - have undergone - has undergone - have undergone - have undergone - have undergone Past Perfect - had undergone - had undergone - had undergone - had undergone - had undergone - had undergone Future Perfect - will have undergone - will have undergone - will have undergone - will have undergone - will have undergone - will have undergone Past conditional - would have undergone - would have undergone - would have undergone - would have undergone - would have undergone - would have undergone Imperative - - - undergo - - - - - - - -