I must poison you must poison she must poison we must poison you must poison they must poison
V-ing form
I must be poisoning you must be poisoning she must be poisoning we must be poisoning you must be poisoning they must be poisoning
Perfect
I must have poisoned you must have poisoned she must have poisoned we must have poisoned you must have poisoned they must have poisoned
V-ing perfect
I must have been poisoning you must have been poisoning she must have been poisoning we must have been poisoning you must have been poisoning they must have been poisoning
Negation
Simple form
I must not poison you must not poison she must not poison we must not poison you must not poison they must not poison
V-ing form
I must not be poisoning you must not be poisoning she must not be poisoning we must not be poisoning you must not be poisoning they must not be poisoning
Perfect
I must not have poisoned you must not have poisoned she must not have poisoned we must not have poisoned you must not have poisoned they must not have poisoned
V-ing perfect
I must not have been poisoning you must not have been poisoning she must not have been poisoning we must not have been poisoning you must not have been poisoning they must not have been poisoning
Interrogative form
Simple form
must I poison? must you poison? must she poison? must we poison? must you poison? must they poison?
V-ing form
must I be poisoning? must you be poisoning? must she be poisoning? must we be poisoning? must you be poisoning? must they be poisoning?
Perfect
must I have poisoned? must you have poisoned? must she have poisoned? must we have poisoned? must you have poisoned? must they have poisoned?
V-ing perfect
must I have been poisoning? must you have been poisoning? must she have been poisoning? must we have been poisoning? must you have been poisoning? must they have been poisoning?
Interro-negative form
Simple form
must I not poison? must you not poison? must she not poison? must we not poison? must you not poison? must they not poison?
V-ing form
must I not be poisoning? must you not be poisoning? must she not be poisoning? must we not be poisoning? must you not be poisoning? must they not be poisoning?
Perfect
must I not have poisoned? must you not have poisoned? must she not have poisoned? must we not have poisoned? must you not have poisoned? must they not have poisoned?
V-ing perfect
must I not have been poisoning? must you not have been poisoning? must she not have been poisoning? must we not have been poisoning? must you not have been poisoning? must they not have been poisoning?