could factor
Verbe régulier : factor - factored- factored

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could factor
you could factor
she could factor
we could factor
you could factor
they could factor 	I could be factoring
you could be factoring
she could be factoring
we could be factoring
you could be factoring
they could be factoring	I could have factored
you could have factored
she could have factored
we could have factored
you could have factored
they could have factored	I could have been factoring
you could have been factoring
she could have been factoring
we could have been factoring
you could have been factoring
they could have been factoring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't factor
you couldn't factor
she couldn't factor
we couldn't factor
you couldn't factor
they couldn't factor 	I couldn't be factoring
you couldn't be factoring
she couldn't be factoring
we couldn't be factoring
you couldn't be factoring
they couldn't be factoring	I couldn't have factored
you couldn't have factored
she couldn't have factored
we couldn't have factored
you couldn't have factored
they couldn't have factored	I couldn't have been factoring
you couldn't have been factoring
she couldn't have been factoring
we couldn't have been factoring
you couldn't have been factoring
they couldn't have been factoring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I factor?
could you factor?
could she factor?
could we factor?
could you factor?
could they factor? 	could I be factoring?
could you be factoring?
could she be factoring?
could we be factoring?
could you be factoring?
could they be factoring? 	could I have factored?
could you have factored?
could she have factored?
could we have factored?
could you have factored?
could they have factored? 	could I have been factoring?
could you have been factoring?
could she have been factoring?
could we have been factoring?
could you have been factoring?
could they have been factoring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I factor?
couldn't you factor?
couldn't she factor?
couldn't we factor?
couldn't you factor?
couldn't they factor? 	couldn't I be factoring?
couldn't you be factoring?
couldn't she be factoring?
couldn't we be factoring?
couldn't you be factoring?
couldn't they be factoring? 	couldn't I have factored?
couldn't you have factored?
couldn't she have factored?
couldn't we have factored?
couldn't you have factored?
couldn't they have factored? 	couldn't I have been factoring?
couldn't you have been factoring?
couldn't she have been factoring?
couldn't we have been factoring?
couldn't you have been factoring?
couldn't they have been factoring?