Present participle; Past participle - underachieving - underachieved Present - underachieve - underachieve - underachieves - underachieve - underachieve - underachieve Past - underachieved - underachieved - underachieved - underachieved - underachieved - underachieved Future - will underachieve - will underachieve - will underachieve - will underachieve - will underachieve - will underachieve Present conditional - would underachieve - would underachieve - would underachieve - would underachieve - would underachieve - would underachieve Present Perfect - have underachieved - have underachieved - has underachieved - have underachieved - have underachieved - have underachieved Past Perfect - had underachieved - had underachieved - had underachieved - had underachieved - had underachieved - had underachieved Future Perfect - will have underachieved - will have underachieved - will have underachieved - will have underachieved - will have underachieved - will have underachieved Past conditional - would have underachieved - would have underachieved - would have underachieved - would have underachieved - would have underachieved - would have underachieved Imperative - - - underachieve - - - - - - - -