must circulate
Regular verb: circulate - circulated- circulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must circulate
you must circulate
she must circulate
we must circulate
you must circulate
they must circulate 	I must be circulating
you must be circulating
she must be circulating
we must be circulating
you must be circulating
they must be circulating	I must have circulated
you must have circulated
she must have circulated
we must have circulated
you must have circulated
they must have circulated	I must have been circulating
you must have been circulating
she must have been circulating
we must have been circulating
you must have been circulating
they must have been circulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not circulate
you must not circulate
she must not circulate
we must not circulate
you must not circulate
they must not circulate 	I must not be circulating
you must not be circulating
she must not be circulating
we must not be circulating
you must not be circulating
they must not be circulating	I must not have circulated
you must not have circulated
she must not have circulated
we must not have circulated
you must not have circulated
they must not have circulated	I must not have been circulating
you must not have been circulating
she must not have been circulating
we must not have been circulating
you must not have been circulating
they must not have been circulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I circulate?
must you circulate?
must she circulate?
must we circulate?
must you circulate?
must they circulate? 	must I be circulating?
must you be circulating?
must she be circulating?
must we be circulating?
must you be circulating?
must they be circulating? 	must I have circulated?
must you have circulated?
must she have circulated?
must we have circulated?
must you have circulated?
must they have circulated? 	must I have been circulating?
must you have been circulating?
must she have been circulating?
must we have been circulating?
must you have been circulating?
must they have been circulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not circulate?
must you not circulate?
must she not circulate?
must we not circulate?
must you not circulate?
must they not circulate? 	must I not be circulating?
must you not be circulating?
must she not be circulating?
must we not be circulating?
must you not be circulating?
must they not be circulating? 	must I not have circulated?
must you not have circulated?
must she not have circulated?
must we not have circulated?
must you not have circulated?
must they not have circulated? 	must I not have been circulating?
must you not have been circulating?
must she not have been circulating?
must we not have been circulating?
must you not have been circulating?
must they not have been circulating?