must differ
Regular verb: differ - differed- differed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?