must circumscribe
Regular verb: circumscribe - circumscribed- circumscribed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must circumscribe
you must circumscribe
she must circumscribe
we must circumscribe
you must circumscribe
they must circumscribe 	I must be circumscribing
you must be circumscribing
she must be circumscribing
we must be circumscribing
you must be circumscribing
they must be circumscribing	I must have circumscribed
you must have circumscribed
she must have circumscribed
we must have circumscribed
you must have circumscribed
they must have circumscribed	I must have been circumscribing
you must have been circumscribing
she must have been circumscribing
we must have been circumscribing
you must have been circumscribing
they must have been circumscribing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not circumscribe
you must not circumscribe
she must not circumscribe
we must not circumscribe
you must not circumscribe
they must not circumscribe 	I must not be circumscribing
you must not be circumscribing
she must not be circumscribing
we must not be circumscribing
you must not be circumscribing
they must not be circumscribing	I must not have circumscribed
you must not have circumscribed
she must not have circumscribed
we must not have circumscribed
you must not have circumscribed
they must not have circumscribed	I must not have been circumscribing
you must not have been circumscribing
she must not have been circumscribing
we must not have been circumscribing
you must not have been circumscribing
they must not have been circumscribing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I circumscribe?
must you circumscribe?
must she circumscribe?
must we circumscribe?
must you circumscribe?
must they circumscribe? 	must I be circumscribing?
must you be circumscribing?
must she be circumscribing?
must we be circumscribing?
must you be circumscribing?
must they be circumscribing? 	must I have circumscribed?
must you have circumscribed?
must she have circumscribed?
must we have circumscribed?
must you have circumscribed?
must they have circumscribed? 	must I have been circumscribing?
must you have been circumscribing?
must she have been circumscribing?
must we have been circumscribing?
must you have been circumscribing?
must they have been circumscribing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not circumscribe?
must you not circumscribe?
must she not circumscribe?
must we not circumscribe?
must you not circumscribe?
must they not circumscribe? 	must I not be circumscribing?
must you not be circumscribing?
must she not be circumscribing?
must we not be circumscribing?
must you not be circumscribing?
must they not be circumscribing? 	must I not have circumscribed?
must you not have circumscribed?
must she not have circumscribed?
must we not have circumscribed?
must you not have circumscribed?
must they not have circumscribed? 	must I not have been circumscribing?
must you not have been circumscribing?
must she not have been circumscribing?
must we not have been circumscribing?
must you not have been circumscribing?
must they not have been circumscribing?