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 must not differentiate
you must not differentiate
she must not differentiate
we must not differentiate
you must not differentiate
they must not differentiate 	I must not be differentiating
you must not be differentiating
she must not be differentiating
we must not be differentiating
you must not be differentiating
they must not be differentiating	I must not have differentiated
you must not have differentiated
she must not have differentiated
we must not have differentiated
you must not have differentiated
they must not have differentiated	I must not have been differentiating
you must not have been differentiating
she must not have been differentiating
we must not have been differentiating
you must not have been differentiating
they must not 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 	
must I not differentiate?
must you not differentiate?
must she not differentiate?
must we not differentiate?
must you not differentiate?
must they not differentiate? 	must I not be differentiating?
must you not be differentiating?
must she not be differentiating?
must we not be differentiating?
must you not be differentiating?
must they not be differentiating? 	must I not have differentiated?
must you not have differentiated?
must she not have differentiated?
must we not have differentiated?
must you not have differentiated?
must they not have differentiated? 	must I not have been differentiating?
must you not have been differentiating?
must she not have been differentiating?
must we not have been differentiating?
must you not have been differentiating?
must they not have been differentiating?