could ruin
Verbe régulier : ruin - ruined- ruined
Traduction française : ruiner - détruire 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could ruin
you could ruin
he could ruin
we could ruin
you could ruin
they could ruin 	I could be ruining
you could be ruining
he could be ruining
we could be ruining
you could be ruining
they could be ruining	I could have ruined
you could have ruined
he could have ruined
we could have ruined
you could have ruined
they could have ruined	I could have been ruining
you could have been ruining
he could have been ruining
we could have been ruining
you could have been ruining
they could have been ruining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't ruin
you couldn't ruin
he couldn't ruin
we couldn't ruin
you couldn't ruin
they couldn't ruin 	I couldn't be ruining
you couldn't be ruining
he couldn't be ruining
we couldn't be ruining
you couldn't be ruining
they couldn't be ruining	I couldn't have ruined
you couldn't have ruined
he couldn't have ruined
we couldn't have ruined
you couldn't have ruined
they couldn't have ruined	I couldn't have been ruining
you couldn't have been ruining
he couldn't have been ruining
we couldn't have been ruining
you couldn't have been ruining
they couldn't have been ruining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I ruin?
could you ruin?
could he ruin?
could we ruin?
could you ruin?
could they ruin? 	could I be ruining?
could you be ruining?
could he be ruining?
could we be ruining?
could you be ruining?
could they be ruining? 	could I have ruined?
could you have ruined?
could he have ruined?
could we have ruined?
could you have ruined?
could they have ruined? 	could I have been ruining?
could you have been ruining?
could he have been ruining?
could we have been ruining?
could you have been ruining?
could they have been ruining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I ruin?
couldn't you ruin?
couldn't he ruin?
couldn't we ruin?
couldn't you ruin?
couldn't they ruin? 	couldn't I be ruining?
couldn't you be ruining?
couldn't he be ruining?
couldn't we be ruining?
couldn't you be ruining?
couldn't they be ruining? 	couldn't I have ruined?
couldn't you have ruined?
couldn't he have ruined?
couldn't we have ruined?
couldn't you have ruined?
couldn't they have ruined? 	couldn't I have been ruining?
couldn't you have been ruining?
couldn't he have been ruining?
couldn't we have been ruining?
couldn't you have been ruining?
couldn't they have been ruining?