English verb conjugation
MUST DIFFER

Regular verb: differ - differed - differed

Affirmation

Simple form	V-ing form
I must differ you must differ she must differ we must differ you must differ they must differ	I must be differing you must be differing she must be differing we must be differing you must be differing they must be differing
Perfect	V-ing perfect
I must have differed you must have differed she must have differed we must have differed you must have differed they must have differed	I must have been differing you must have been differing she must have been differing we must have been differing you must have been differing they must have been differing

Negation

Simple form	V-ing form
I must not differ you must not differ she must not differ we must not differ you must not differ they must not differ	I must not be differing you must not be differing she must not be differing we must not be differing you must not be differing they must not be differing
Perfect	V-ing perfect
I must not have differed you must not have differed she must not have differed we must not have differed you must not have differed they must not have differed	I must not have been differing you must not have been differing she must not have been differing we must not have been differing you must not have been differing they must not have been differing

Interrogative form

Simple form	V-ing form
must I differ? must you differ? must she differ? must we differ? must you differ? must they differ?	must I be differing? must you be differing? must she be differing? must we be differing? must you be differing? must they be differing?
Perfect	V-ing perfect
must I have differed? must you have differed? must she have differed? must we have differed? must you have differed? must they have differed?	must I have been differing? must you have been differing? must she have been differing? must we have been differing? must you have been differing? must they have been differing?

Interro-negative form

Simple form	V-ing form
must I not differ? must you not differ? must she not differ? must we not differ? must you not differ? must they not differ?	must I not be differing? must you not be differing? must she not be differing? must we not be differing? must you not be differing? must they not be differing?
Perfect	V-ing perfect
must I not have differed? must you not have differed? must she not have differed? must we not have differed? must you not have differed? must they not have differed?	must I not have been differing? must you not have been differing? must she not have been differing? must we not have been differing? must you not have been differing? must they not have been differing?