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 mustn't incur you mustn't incur she mustn't incur we mustn't incur you mustn't incur they mustn't incur	I mustn't be incurring you mustn't be incurring she mustn't be incurring we mustn't be incurring you mustn't be incurring they mustn't be incurring
Perfect	V-ing perfect
I mustn't have incurred you mustn't have incurred she mustn't have incurred we mustn't have incurred you mustn't have incurred they mustn't have incurred	I mustn't have been incurring you mustn't have been incurring she mustn't have been incurring we mustn't have been incurring you mustn't have been incurring they mustn't 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
mustn't I incur? mustn't you incur? mustn't she incur? mustn't we incur? mustn't you incur? mustn't they incur?	mustn't I be incurring? mustn't you be incurring? mustn't she be incurring? mustn't we be incurring? mustn't you be incurring? mustn't they be incurring?
Perfect	V-ing perfect
mustn't I have incurred? mustn't you have incurred? mustn't she have incurred? mustn't we have incurred? mustn't you have incurred? mustn't they have incurred?	mustn't I have been incurring? mustn't you have been incurring? mustn't she have been incurring? mustn't we have been incurring? mustn't you have been incurring? mustn't they have been incurring?