could contaminate
Verbo regular: contaminate - contaminated- contaminated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could contaminate
you could contaminate
she could contaminate
we could contaminate
you could contaminate
they could contaminate 	I could be contaminating
you could be contaminating
she could be contaminating
we could be contaminating
you could be contaminating
they could be contaminating	I could have contaminated
you could have contaminated
she could have contaminated
we could have contaminated
you could have contaminated
they could have contaminated	I could have been contaminating
you could have been contaminating
she could have been contaminating
we could have been contaminating
you could have been contaminating
they could have been contaminating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't contaminate
you couldn't contaminate
she couldn't contaminate
we couldn't contaminate
you couldn't contaminate
they couldn't contaminate 	I couldn't be contaminating
you couldn't be contaminating
she couldn't be contaminating
we couldn't be contaminating
you couldn't be contaminating
they couldn't be contaminating	I couldn't have contaminated
you couldn't have contaminated
she couldn't have contaminated
we couldn't have contaminated
you couldn't have contaminated
they couldn't have contaminated	I couldn't have been contaminating
you couldn't have been contaminating
she couldn't have been contaminating
we couldn't have been contaminating
you couldn't have been contaminating
they couldn't have been contaminating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I contaminate?
could you contaminate?
could she contaminate?
could we contaminate?
could you contaminate?
could they contaminate? 	could I be contaminating?
could you be contaminating?
could she be contaminating?
could we be contaminating?
could you be contaminating?
could they be contaminating? 	could I have contaminated?
could you have contaminated?
could she have contaminated?
could we have contaminated?
could you have contaminated?
could they have contaminated? 	could I have been contaminating?
could you have been contaminating?
could she have been contaminating?
could we have been contaminating?
could you have been contaminating?
could they have been contaminating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I contaminate?
couldn't you contaminate?
couldn't she contaminate?
couldn't we contaminate?
couldn't you contaminate?
couldn't they contaminate? 	couldn't I be contaminating?
couldn't you be contaminating?
couldn't she be contaminating?
couldn't we be contaminating?
couldn't you be contaminating?
couldn't they be contaminating? 	couldn't I have contaminated?
couldn't you have contaminated?
couldn't she have contaminated?
couldn't we have contaminated?
couldn't you have contaminated?
couldn't they have contaminated? 	couldn't I have been contaminating?
couldn't you have been contaminating?
couldn't she have been contaminating?
couldn't we have been contaminating?
couldn't you have been contaminating?
couldn't they have been contaminating?