could poison
Verbo regular: poison - poisoned- poisoned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could poison
you could poison
he could poison
we could poison
you could poison
they could poison 	I could be poisoning
you could be poisoning
he could be poisoning
we could be poisoning
you could be poisoning
they could be poisoning	I could have poisoned
you could have poisoned
he could have poisoned
we could have poisoned
you could have poisoned
they could have poisoned	I could have been poisoning
you could have been poisoning
he could have been poisoning
we could have been poisoning
you could have been poisoning
they could have been poisoning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't poison
you couldn't poison
he couldn't poison
we couldn't poison
you couldn't poison
they couldn't poison 	I couldn't be poisoning
you couldn't be poisoning
he couldn't be poisoning
we couldn't be poisoning
you couldn't be poisoning
they couldn't be poisoning	I couldn't have poisoned
you couldn't have poisoned
he couldn't have poisoned
we couldn't have poisoned
you couldn't have poisoned
they couldn't have poisoned	I couldn't have been poisoning
you couldn't have been poisoning
he couldn't have been poisoning
we couldn't have been poisoning
you couldn't have been poisoning
they couldn't have been poisoning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I poison?
could you poison?
could he poison?
could we poison?
could you poison?
could they poison? 	could I be poisoning?
could you be poisoning?
could he be poisoning?
could we be poisoning?
could you be poisoning?
could they be poisoning? 	could I have poisoned?
could you have poisoned?
could he have poisoned?
could we have poisoned?
could you have poisoned?
could they have poisoned? 	could I have been poisoning?
could you have been poisoning?
could he have been poisoning?
could we have been poisoning?
could you have been poisoning?
could they have been poisoning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I poison?
couldn't you poison?
couldn't he poison?
couldn't we poison?
couldn't you poison?
couldn't they poison? 	couldn't I be poisoning?
couldn't you be poisoning?
couldn't he be poisoning?
couldn't we be poisoning?
couldn't you be poisoning?
couldn't they be poisoning? 	couldn't I have poisoned?
couldn't you have poisoned?
couldn't he have poisoned?
couldn't we have poisoned?
couldn't you have poisoned?
couldn't they have poisoned? 	couldn't I have been poisoning?
couldn't you have been poisoning?
couldn't he have been poisoning?
couldn't we have been poisoning?
couldn't you have been poisoning?
couldn't they have been poisoning?