could sour
Verbe régulier : sour - soured- soured
Traduction française : surir - aigrir 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could sour
you could sour
he could sour
we could sour
you could sour
they could sour 	I could be souring
you could be souring
he could be souring
we could be souring
you could be souring
they could be souring	I could have soured
you could have soured
he could have soured
we could have soured
you could have soured
they could have soured	I could have been souring
you could have been souring
he could have been souring
we could have been souring
you could have been souring
they could have been souring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't sour
you couldn't sour
he couldn't sour
we couldn't sour
you couldn't sour
they couldn't sour 	I couldn't be souring
you couldn't be souring
he couldn't be souring
we couldn't be souring
you couldn't be souring
they couldn't be souring	I couldn't have soured
you couldn't have soured
he couldn't have soured
we couldn't have soured
you couldn't have soured
they couldn't have soured	I couldn't have been souring
you couldn't have been souring
he couldn't have been souring
we couldn't have been souring
you couldn't have been souring
they couldn't have been souring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I sour?
could you sour?
could he sour?
could we sour?
could you sour?
could they sour? 	could I be souring?
could you be souring?
could he be souring?
could we be souring?
could you be souring?
could they be souring? 	could I have soured?
could you have soured?
could he have soured?
could we have soured?
could you have soured?
could they have soured? 	could I have been souring?
could you have been souring?
could he have been souring?
could we have been souring?
could you have been souring?
could they have been souring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I sour?
couldn't you sour?
couldn't he sour?
couldn't we sour?
couldn't you sour?
couldn't they sour? 	couldn't I be souring?
couldn't you be souring?
couldn't he be souring?
couldn't we be souring?
couldn't you be souring?
couldn't they be souring? 	couldn't I have soured?
couldn't you have soured?
couldn't he have soured?
couldn't we have soured?
couldn't you have soured?
couldn't they have soured? 	couldn't I have been souring?
couldn't you have been souring?
couldn't he have been souring?
couldn't we have been souring?
couldn't you have been souring?
couldn't they have been souring?