English verb conjugation
CAN POISON

Regular verb: poison - poisoned - poisoned

Affirmation

Simple form	V-ing form
I can poison you can poison he can poison we can poison you can poison they can poison	I can be poisoning you can be poisoning he can be poisoning we can be poisoning you can be poisoning they can be poisoning
Perfect	V-ing perfect
I can have poisoned you can have poisoned he can have poisoned we can have poisoned you can have poisoned they can have poisoned	I can have been poisoning you can have been poisoning he can have been poisoning we can have been poisoning you can have been poisoning they can have been poisoning

Negation

Simple form	V-ing form
I can't poison you can't poison he can't poison we can't poison you can't poison they can't poison	I can't be poisoning you can't be poisoning he can't be poisoning we can't be poisoning you can't be poisoning they can't be poisoning
Perfect	V-ing perfect
I can't have poisoned you can't have poisoned he can't have poisoned we can't have poisoned you can't have poisoned they can't have poisoned	I can't have been poisoning you can't have been poisoning he can't have been poisoning we can't have been poisoning you can't have been poisoning they can't have been poisoning

Interrogative form

Simple form	V-ing form
can I poison? can you poison? can he poison? can we poison? can you poison? can they poison?	can I be poisoning? can you be poisoning? can he be poisoning? can we be poisoning? can you be poisoning? can they be poisoning?
Perfect	V-ing perfect
can I have poisoned? can you have poisoned? can he have poisoned? can we have poisoned? can you have poisoned? can they have poisoned?	can I have been poisoning? can you have been poisoning? can he have been poisoning? can we have been poisoning? can you have been poisoning? can they have been poisoning?

Interro-negative form

Simple form	V-ing form
can't I poison? can't you poison? can't he poison? can't we poison? can't you poison? can't they poison?	can't I be poisoning? can't you be poisoning? can't he be poisoning? can't we be poisoning? can't you be poisoning? can't they be poisoning?
Perfect	V-ing perfect
can't I have poisoned? can't you have poisoned? can't he have poisoned? can't we have poisoned? can't you have poisoned? can't they have poisoned?	can't I have been poisoning? can't you have been poisoning? can't he have been poisoning? can't we have been poisoning? can't you have been poisoning? can't they have been poisoning?