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
she could underperform
we could underperform
you could underperform
they could underperform 	I could be underperforming
you could be underperforming
she could be underperforming
we could be underperforming
you could be underperforming
they could be underperforming	I could have underperformed
you could have underperformed
she 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
she 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 couldn't underperform
you couldn't underperform
she couldn't underperform
we couldn't underperform
you couldn't underperform
they couldn't underperform 	I couldn't be underperforming
you couldn't be underperforming
she couldn't be underperforming
we couldn't be underperforming
you couldn't be underperforming
they couldn't be underperforming	I couldn't have underperformed
you couldn't have underperformed
she couldn't have underperformed
we couldn't have underperformed
you couldn't have underperformed
they couldn't have underperformed	I couldn't have been underperforming
you couldn't have been underperforming
she couldn't have been underperforming
we couldn't have been underperforming
you couldn't have been underperforming
they couldn't have been underperforming	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I underperform?
could you underperform?
could she underperform?
could we underperform?
could you underperform?
could they underperform? 	could I be underperforming?
could you be underperforming?
could she be underperforming?
could we be underperforming?
could you be underperforming?
could they be underperforming? 	could I have underperformed?
could you have underperformed?
could she 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 she 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 	
couldn't I underperform?
couldn't you underperform?
couldn't she underperform?
couldn't we underperform?
couldn't you underperform?
couldn't they underperform? 	couldn't I be underperforming?
couldn't you be underperforming?
couldn't she be underperforming?
couldn't we be underperforming?
couldn't you be underperforming?
couldn't they be underperforming? 	couldn't I have underperformed?
couldn't you have underperformed?
couldn't she have underperformed?
couldn't we have underperformed?
couldn't you have underperformed?
couldn't they have underperformed? 	couldn't I have been underperforming?
couldn't you have been underperforming?
couldn't she have been underperforming?
couldn't we have been underperforming?
couldn't you have been underperforming?
couldn't they have been underperforming?