could poison
Regular verb: poison - poisoned- poisoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not poison
you could not poison
he could not poison
we could not poison
you could not poison
they could not poison 	I could not be poisoning
you could not be poisoning
he could not be poisoning
we could not be poisoning
you could not be poisoning
they could not be poisoning	I could not have poisoned
you could not have poisoned
he could not have poisoned
we could not have poisoned
you could not have poisoned
they could not have poisoned	I could not have been poisoning
you could not have been poisoning
he could not have been poisoning
we could not have been poisoning
you could not have been poisoning
they could not have been poisoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not poison?
could you not poison?
could he not poison?
could we not poison?
could you not poison?
could they not poison? 	could I not be poisoning?
could you not be poisoning?
could he not be poisoning?
could we not be poisoning?
could you not be poisoning?
could they not be poisoning? 	could I not have poisoned?
could you not have poisoned?
could he not have poisoned?
could we not have poisoned?
could you not have poisoned?
could they not have poisoned? 	could I not have been poisoning?
could you not have been poisoning?
could he not have been poisoning?
could we not have been poisoning?
could you not have been poisoning?
could they not have been poisoning?