I must differentiate you must differentiate she must differentiate we must differentiate you must differentiate they must differentiate
V-ing form
I must be differentiating you must be differentiating she must be differentiating we must be differentiating you must be differentiating they must be differentiating
Perfect
I must have differentiated you must have differentiated she must have differentiated we must have differentiated you must have differentiated they must have differentiated
V-ing perfect
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
I must not differentiate you must not differentiate she must not differentiate we must not differentiate you must not differentiate they must not differentiate
V-ing form
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
Perfect
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
V-ing perfect
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
must I differentiate? must you differentiate? must she differentiate? must we differentiate? must you differentiate? must they differentiate?
V-ing form
must I be differentiating? must you be differentiating? must she be differentiating? must we be differentiating? must you be differentiating? must they be differentiating?
Perfect
must I have differentiated? must you have differentiated? must she have differentiated? must we have differentiated? must you have differentiated? must they have differentiated?
V-ing perfect
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
must I not differentiate? must you not differentiate? must she not differentiate? must we not differentiate? must you not differentiate? must they not differentiate?
V-ing form
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?
Perfect
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?
V-ing perfect
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?