must differentiate
Regular verb: differentiate - differentiated- differentiated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must differentiate
you must differentiate
she must differentiate
we must differentiate
you must differentiate
they must differentiate 	I must be differentiating
you must be differentiating
she must be differentiating
we must be differentiating
you must be differentiating
they must be differentiating	I must have differentiated
you must have differentiated
she 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
she 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
she 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
she 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
she 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
she 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 she differentiate?
must we differentiate?
must you differentiate?
must they differentiate? 	must I be differentiating?
must you be differentiating?
must she be differentiating?
must we be differentiating?
must you be differentiating?
must they be differentiating? 	must I have differentiated?
must you have differentiated?
must she 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 she 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 she 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 she 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 she 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 she have been differentiating?
mustn't we have been differentiating?
mustn't you have been differentiating?
mustn't they have been differentiating?