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
she could ruin
we could ruin
you could ruin
they could ruin 	I could be ruining
you could be ruining
she could be ruining
we could be ruining
you could be ruining
they could be ruining	I could have ruined
you could have ruined
she 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
she 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
she 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
she 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
she 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
she 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 she ruin?
could we ruin?
could you ruin?
could they ruin? 	could I be ruining?
could you be ruining?
could she be ruining?
could we be ruining?
could you be ruining?
could they be ruining? 	could I have ruined?
could you have ruined?
could she 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 she 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 she 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 she 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 she 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 she have been ruining?
couldn't we have been ruining?
couldn't you have been ruining?
couldn't they have been ruining?