must poison
Regular verb: poison - poisoned- poisoned

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

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

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