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