English verb conjugation
COULD POISON

Regular verb: poison - poisoned - poisoned

Affirmation

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

Interrogative form

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