could improve
Verbe régulier : improve - improved- improved
Traduction française : améliorer - s'améliorer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could improve
you could improve
she could improve
we could improve
you could improve
they could improve 	I could be improving
you could be improving
she could be improving
we could be improving
you could be improving
they could be improving	I could have improved
you could have improved
she could have improved
we could have improved
you could have improved
they could have improved	I could have been improving
you could have been improving
she could have been improving
we could have been improving
you could have been improving
they could have been improving	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not improve
you could not improve
she could not improve
we could not improve
you could not improve
they could not improve 	I could not be improving
you could not be improving
she could not be improving
we could not be improving
you could not be improving
they could not be improving	I could not have improved
you could not have improved
she could not have improved
we could not have improved
you could not have improved
they could not have improved	I could not have been improving
you could not have been improving
she could not have been improving
we could not have been improving
you could not have been improving
they could not have been improving	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I improve?
could you improve?
could she improve?
could we improve?
could you improve?
could they improve? 	could I be improving?
could you be improving?
could she be improving?
could we be improving?
could you be improving?
could they be improving? 	could I have improved?
could you have improved?
could she have improved?
could we have improved?
could you have improved?
could they have improved? 	could I have been improving?
could you have been improving?
could she have been improving?
could we have been improving?
could you have been improving?
could they have been improving? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not improve?
could you not improve?
could she not improve?
could we not improve?
could you not improve?
could they not improve? 	could I not be improving?
could you not be improving?
could she not be improving?
could we not be improving?
could you not be improving?
could they not be improving? 	could I not have improved?
could you not have improved?
could she not have improved?
could we not have improved?
could you not have improved?
could they not have improved? 	could I not have been improving?
could you not have been improving?
could she not have been improving?
could we not have been improving?
could you not have been improving?
could they not have been improving?