English verb conjugation
MUST INCUR

Regular verb: incur - incurred - incurred

Affirmation

Simple form	V-ing form
I must incur you must incur she must incur we must incur you must incur they must incur	I must be incurring you must be incurring she must be incurring we must be incurring you must be incurring they must be incurring
Perfect	V-ing perfect
I must have incurred you must have incurred she must have incurred we must have incurred you must have incurred they must have incurred	I must have been incurring you must have been incurring she must have been incurring we must have been incurring you must have been incurring they must have been incurring

Negation

Simple form	V-ing form
I must not incur you must not incur she must not incur we must not incur you must not incur they must not incur	I must not be incurring you must not be incurring she must not be incurring we must not be incurring you must not be incurring they must not be incurring
Perfect	V-ing perfect
I must not have incurred you must not have incurred she must not have incurred we must not have incurred you must not have incurred they must not have incurred	I must not have been incurring you must not have been incurring she must not have been incurring we must not have been incurring you must not have been incurring they must not have been incurring

Interrogative form

Simple form	V-ing form
must I incur? must you incur? must she incur? must we incur? must you incur? must they incur?	must I be incurring? must you be incurring? must she be incurring? must we be incurring? must you be incurring? must they be incurring?
Perfect	V-ing perfect
must I have incurred? must you have incurred? must she have incurred? must we have incurred? must you have incurred? must they have incurred?	must I have been incurring? must you have been incurring? must she have been incurring? must we have been incurring? must you have been incurring? must they have been incurring?

Interro-negative form

Simple form	V-ing form
must I not incur? must you not incur? must she not incur? must we not incur? must you not incur? must they not incur?	must I not be incurring? must you not be incurring? must she not be incurring? must we not be incurring? must you not be incurring? must they not be incurring?
Perfect	V-ing perfect
must I not have incurred? must you not have incurred? must she not have incurred? must we not have incurred? must you not have incurred? must they not have incurred?	must I not have been incurring? must you not have been incurring? must she not have been incurring? must we not have been incurring? must you not have been incurring? must they not have been incurring?