English verb conjugation
COULD POISON

Regular verb: poison - poisoned - poisoned

Affirmation

Simple form	V-ing form
I could poison you could poison she could poison we could poison you could poison they could poison	I could be poisoning you could be poisoning she 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 she 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 she 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 she 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 she 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 she 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 she 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 she poison? could we poison? could you poison? could they poison?	could I be poisoning? could you be poisoning? could she 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 she 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 she 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 she 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 she 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 she 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 she have been poisoning? couldn't we have been poisoning? couldn't you have been poisoning? couldn't they have been poisoning?