could underperform
Verbe régulier : underperform - underperformed- underperformed
Traduction française : rester en deçà de ses possibilités 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could underperform
you could underperform
he could underperform
we could underperform
you could underperform
they could underperform 	I could be underperforming
you could be underperforming
he could be underperforming
we could be underperforming
you could be underperforming
they could be underperforming	I could have underperformed
you could have underperformed
he could have underperformed
we could have underperformed
you could have underperformed
they could have underperformed	I could have been underperforming
you could have been underperforming
he could have been underperforming
we could have been underperforming
you could have been underperforming
they could have been underperforming	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not underperform
you could not underperform
he could not underperform
we could not underperform
you could not underperform
they could not underperform 	I could not be underperforming
you could not be underperforming
he could not be underperforming
we could not be underperforming
you could not be underperforming
they could not be underperforming	I could not have underperformed
you could not have underperformed
he could not have underperformed
we could not have underperformed
you could not have underperformed
they could not have underperformed	I could not have been underperforming
you could not have been underperforming
he could not have been underperforming
we could not have been underperforming
you could not have been underperforming
they could not have been underperforming	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I underperform?
could you underperform?
could he underperform?
could we underperform?
could you underperform?
could they underperform? 	could I be underperforming?
could you be underperforming?
could he be underperforming?
could we be underperforming?
could you be underperforming?
could they be underperforming? 	could I have underperformed?
could you have underperformed?
could he have underperformed?
could we have underperformed?
could you have underperformed?
could they have underperformed? 	could I have been underperforming?
could you have been underperforming?
could he have been underperforming?
could we have been underperforming?
could you have been underperforming?
could they have been underperforming? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not underperform?
could you not underperform?
could he not underperform?
could we not underperform?
could you not underperform?
could they not underperform? 	could I not be underperforming?
could you not be underperforming?
could he not be underperforming?
could we not be underperforming?
could you not be underperforming?
could they not be underperforming? 	could I not have underperformed?
could you not have underperformed?
could he not have underperformed?
could we not have underperformed?
could you not have underperformed?
could they not have underperformed? 	could I not have been underperforming?
could you not have been underperforming?
could he not have been underperforming?
could we not have been underperforming?
could you not have been underperforming?
could they not have been underperforming?