must pain
Regular verb: pain - pained- pained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pain
you must pain
he must pain
we must pain
you must pain
they must pain 	I must be paining
you must be paining
he must be paining
we must be paining
you must be paining
they must be paining	I must have pained
you must have pained
he must have pained
we must have pained
you must have pained
they must have pained	I must have been paining
you must have been paining
he must have been paining
we must have been paining
you must have been paining
they must have been paining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not pain
you must not pain
he must not pain
we must not pain
you must not pain
they must not pain 	I must not be paining
you must not be paining
he must not be paining
we must not be paining
you must not be paining
they must not be paining	I must not have pained
you must not have pained
he must not have pained
we must not have pained
you must not have pained
they must not have pained	I must not have been paining
you must not have been paining
he must not have been paining
we must not have been paining
you must not have been paining
they must not have been paining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pain?
must you pain?
must he pain?
must we pain?
must you pain?
must they pain? 	must I be paining?
must you be paining?
must he be paining?
must we be paining?
must you be paining?
must they be paining? 	must I have pained?
must you have pained?
must he have pained?
must we have pained?
must you have pained?
must they have pained? 	must I have been paining?
must you have been paining?
must he have been paining?
must we have been paining?
must you have been paining?
must they have been paining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not pain?
must you not pain?
must he not pain?
must we not pain?
must you not pain?
must they not pain? 	must I not be paining?
must you not be paining?
must he not be paining?
must we not be paining?
must you not be paining?
must they not be paining? 	must I not have pained?
must you not have pained?
must he not have pained?
must we not have pained?
must you not have pained?
must they not have pained? 	must I not have been paining?
must you not have been paining?
must he not have been paining?
must we not have been paining?
must you not have been paining?
must they not have been paining?