must differentiate
Regular verb: differentiate - differentiated- differentiated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must differentiate
you must differentiate
he must differentiate
we must differentiate
you must differentiate
they must differentiate 	I must be differentiating
you must be differentiating
he must be differentiating
we must be differentiating
you must be differentiating
they must be differentiating	I must have differentiated
you must have differentiated
he must have differentiated
we must have differentiated
you must have differentiated
they must have differentiated	I must have been differentiating
you must have been differentiating
he must have been differentiating
we must have been differentiating
you must have been differentiating
they must have been differentiating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't differentiate
you mustn't differentiate
he mustn't differentiate
we mustn't differentiate
you mustn't differentiate
they mustn't differentiate 	I mustn't be differentiating
you mustn't be differentiating
he mustn't be differentiating
we mustn't be differentiating
you mustn't be differentiating
they mustn't be differentiating	I mustn't have differentiated
you mustn't have differentiated
he mustn't have differentiated
we mustn't have differentiated
you mustn't have differentiated
they mustn't have differentiated	I mustn't have been differentiating
you mustn't have been differentiating
he mustn't have been differentiating
we mustn't have been differentiating
you mustn't have been differentiating
they mustn't have been differentiating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I differentiate?
must you differentiate?
must he differentiate?
must we differentiate?
must you differentiate?
must they differentiate? 	must I be differentiating?
must you be differentiating?
must he be differentiating?
must we be differentiating?
must you be differentiating?
must they be differentiating? 	must I have differentiated?
must you have differentiated?
must he have differentiated?
must we have differentiated?
must you have differentiated?
must they have differentiated? 	must I have been differentiating?
must you have been differentiating?
must he have been differentiating?
must we have been differentiating?
must you have been differentiating?
must they have been differentiating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I differentiate?
mustn't you differentiate?
mustn't he differentiate?
mustn't we differentiate?
mustn't you differentiate?
mustn't they differentiate? 	mustn't I be differentiating?
mustn't you be differentiating?
mustn't he be differentiating?
mustn't we be differentiating?
mustn't you be differentiating?
mustn't they be differentiating? 	mustn't I have differentiated?
mustn't you have differentiated?
mustn't he have differentiated?
mustn't we have differentiated?
mustn't you have differentiated?
mustn't they have differentiated? 	mustn't I have been differentiating?
mustn't you have been differentiating?
mustn't he have been differentiating?
mustn't we have been differentiating?
mustn't you have been differentiating?
mustn't they have been differentiating?