can ruin
Verbo regular: ruin - ruined- ruined

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can ruin
you can ruin
he can ruin
we can ruin
you can ruin
they can ruin 	I can be ruining
you can be ruining
he can be ruining
we can be ruining
you can be ruining
they can be ruining	I can have ruined
you can have ruined
he can have ruined
we can have ruined
you can have ruined
they can have ruined	I can have been ruining
you can have been ruining
he can have been ruining
we can have been ruining
you can have been ruining
they can have been ruining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot ruin
you cannot ruin
he cannot ruin
we cannot ruin
you cannot ruin
they cannot ruin 	I cannot be ruining
you cannot be ruining
he cannot be ruining
we cannot be ruining
you cannot be ruining
they cannot be ruining	I cannot have ruined
you cannot have ruined
he cannot have ruined
we cannot have ruined
you cannot have ruined
they cannot have ruined	I cannot have been ruining
you cannot have been ruining
he cannot have been ruining
we cannot have been ruining
you cannot have been ruining
they cannot have been ruining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I ruin?
can you ruin?
can he ruin?
can we ruin?
can you ruin?
can they ruin? 	can I be ruining?
can you be ruining?
can he be ruining?
can we be ruining?
can you be ruining?
can they be ruining? 	can I have ruined?
can you have ruined?
can he have ruined?
can we have ruined?
can you have ruined?
can they have ruined? 	can I have been ruining?
can you have been ruining?
can he have been ruining?
can we have been ruining?
can you have been ruining?
can they have been ruining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not ruin?
can you not ruin?
can he not ruin?
can we not ruin?
can you not ruin?
can they not ruin? 	can I not be ruining?
can you not be ruining?
can he not be ruining?
can we not be ruining?
can you not be ruining?
can they not be ruining? 	can I not have ruined?
can you not have ruined?
can he not have ruined?
can we not have ruined?
can you not have ruined?
can they not have ruined? 	can I not have been ruining?
can you not have been ruining?
can he not have been ruining?
can we not have been ruining?
can you not have been ruining?
can they not have been ruining?