must first-foot
Regular verb: first-foot - first-footed- first-footed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must first-foot
you must first-foot
he must first-foot
we must first-foot
you must first-foot
they must first-foot 	I must be first-footing
you must be first-footing
he must be first-footing
we must be first-footing
you must be first-footing
they must be first-footing	I must have first-footed
you must have first-footed
he must have first-footed
we must have first-footed
you must have first-footed
they must have first-footed	I must have been first-footing
you must have been first-footing
he must have been first-footing
we must have been first-footing
you must have been first-footing
they must have been first-footing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not first-foot
you must not first-foot
he must not first-foot
we must not first-foot
you must not first-foot
they must not first-foot 	I must not be first-footing
you must not be first-footing
he must not be first-footing
we must not be first-footing
you must not be first-footing
they must not be first-footing	I must not have first-footed
you must not have first-footed
he must not have first-footed
we must not have first-footed
you must not have first-footed
they must not have first-footed	I must not have been first-footing
you must not have been first-footing
he must not have been first-footing
we must not have been first-footing
you must not have been first-footing
they must not have been first-footing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I first-foot?
must you first-foot?
must he first-foot?
must we first-foot?
must you first-foot?
must they first-foot? 	must I be first-footing?
must you be first-footing?
must he be first-footing?
must we be first-footing?
must you be first-footing?
must they be first-footing? 	must I have first-footed?
must you have first-footed?
must he have first-footed?
must we have first-footed?
must you have first-footed?
must they have first-footed? 	must I have been first-footing?
must you have been first-footing?
must he have been first-footing?
must we have been first-footing?
must you have been first-footing?
must they have been first-footing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not first-foot?
must you not first-foot?
must he not first-foot?
must we not first-foot?
must you not first-foot?
must they not first-foot? 	must I not be first-footing?
must you not be first-footing?
must he not be first-footing?
must we not be first-footing?
must you not be first-footing?
must they not be first-footing? 	must I not have first-footed?
must you not have first-footed?
must he not have first-footed?
must we not have first-footed?
must you not have first-footed?
must they not have first-footed? 	must I not have been first-footing?
must you not have been first-footing?
must he not have been first-footing?
must we not have been first-footing?
must you not have been first-footing?
must they not have been first-footing?