I must fulfill you must fulfill she must fulfill we must fulfill you must fulfill they must fulfill
V-ing form
I must be fulfilling you must be fulfilling she must be fulfilling we must be fulfilling you must be fulfilling they must be fulfilling
Perfect
I must have fulfilled you must have fulfilled she must have fulfilled we must have fulfilled you must have fulfilled they must have fulfilled
V-ing perfect
I must have been fulfilling you must have been fulfilling she must have been fulfilling we must have been fulfilling you must have been fulfilling they must have been fulfilling
Negation
Simple form
I must not fulfill you must not fulfill she must not fulfill we must not fulfill you must not fulfill they must not fulfill
V-ing form
I must not be fulfilling you must not be fulfilling she must not be fulfilling we must not be fulfilling you must not be fulfilling they must not be fulfilling
Perfect
I must not have fulfilled you must not have fulfilled she must not have fulfilled we must not have fulfilled you must not have fulfilled they must not have fulfilled
V-ing perfect
I must not have been fulfilling you must not have been fulfilling she must not have been fulfilling we must not have been fulfilling you must not have been fulfilling they must not have been fulfilling
Interrogative form
Simple form
must I fulfill? must you fulfill? must she fulfill? must we fulfill? must you fulfill? must they fulfill?
V-ing form
must I be fulfilling? must you be fulfilling? must she be fulfilling? must we be fulfilling? must you be fulfilling? must they be fulfilling?
Perfect
must I have fulfilled? must you have fulfilled? must she have fulfilled? must we have fulfilled? must you have fulfilled? must they have fulfilled?
V-ing perfect
must I have been fulfilling? must you have been fulfilling? must she have been fulfilling? must we have been fulfilling? must you have been fulfilling? must they have been fulfilling?
Interro-negative form
Simple form
must I not fulfill? must you not fulfill? must she not fulfill? must we not fulfill? must you not fulfill? must they not fulfill?
V-ing form
must I not be fulfilling? must you not be fulfilling? must she not be fulfilling? must we not be fulfilling? must you not be fulfilling? must they not be fulfilling?
Perfect
must I not have fulfilled? must you not have fulfilled? must she not have fulfilled? must we not have fulfilled? must you not have fulfilled? must they not have fulfilled?
V-ing perfect
must I not have been fulfilling? must you not have been fulfilling? must she not have been fulfilling? must we not have been fulfilling? must you not have been fulfilling? must they not have been fulfilling?