must fox
Regular verb: fox - foxed- foxed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fox
you must fox
she must fox
we must fox
you must fox
they must fox 	I must be foxing
you must be foxing
she must be foxing
we must be foxing
you must be foxing
they must be foxing	I must have foxed
you must have foxed
she must have foxed
we must have foxed
you must have foxed
they must have foxed	I must have been foxing
you must have been foxing
she must have been foxing
we must have been foxing
you must have been foxing
they must have been foxing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not fox
you must not fox
she must not fox
we must not fox
you must not fox
they must not fox 	I must not be foxing
you must not be foxing
she must not be foxing
we must not be foxing
you must not be foxing
they must not be foxing	I must not have foxed
you must not have foxed
she must not have foxed
we must not have foxed
you must not have foxed
they must not have foxed	I must not have been foxing
you must not have been foxing
she must not have been foxing
we must not have been foxing
you must not have been foxing
they must not have been foxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fox?
must you fox?
must she fox?
must we fox?
must you fox?
must they fox? 	must I be foxing?
must you be foxing?
must she be foxing?
must we be foxing?
must you be foxing?
must they be foxing? 	must I have foxed?
must you have foxed?
must she have foxed?
must we have foxed?
must you have foxed?
must they have foxed? 	must I have been foxing?
must you have been foxing?
must she have been foxing?
must we have been foxing?
must you have been foxing?
must they have been foxing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not fox?
must you not fox?
must she not fox?
must we not fox?
must you not fox?
must they not fox? 	must I not be foxing?
must you not be foxing?
must she not be foxing?
must we not be foxing?
must you not be foxing?
must they not be foxing? 	must I not have foxed?
must you not have foxed?
must she not have foxed?
must we not have foxed?
must you not have foxed?
must they not have foxed? 	must I not have been foxing?
must you not have been foxing?
must she not have been foxing?
must we not have been foxing?
must you not have been foxing?
must they not have been foxing?