English verb conjugation
MUST CASE

Regular verb: case - cased - cased

Affirmation

Simple form	V-ing form
I must case you must case she must case we must case you must case they must case	I must be casing you must be casing she must be casing we must be casing you must be casing they must be casing
Perfect	V-ing perfect
I must have cased you must have cased she must have cased we must have cased you must have cased they must have cased	I must have been casing you must have been casing she must have been casing we must have been casing you must have been casing they must have been casing

Negation

Simple form	V-ing form
I must not case you must not case she must not case we must not case you must not case they must not case	I must not be casing you must not be casing she must not be casing we must not be casing you must not be casing they must not be casing
Perfect	V-ing perfect
I must not have cased you must not have cased she must not have cased we must not have cased you must not have cased they must not have cased	I must not have been casing you must not have been casing she must not have been casing we must not have been casing you must not have been casing they must not have been casing

Interrogative form

Simple form	V-ing form
must I case? must you case? must she case? must we case? must you case? must they case?	must I be casing? must you be casing? must she be casing? must we be casing? must you be casing? must they be casing?
Perfect	V-ing perfect
must I have cased? must you have cased? must she have cased? must we have cased? must you have cased? must they have cased?	must I have been casing? must you have been casing? must she have been casing? must we have been casing? must you have been casing? must they have been casing?

Interro-negative form

Simple form	V-ing form
must I not case? must you not case? must she not case? must we not case? must you not case? must they not case?	must I not be casing? must you not be casing? must she not be casing? must we not be casing? must you not be casing? must they not be casing?
Perfect	V-ing perfect
must I not have cased? must you not have cased? must she not have cased? must we not have cased? must you not have cased? must they not have cased?	must I not have been casing? must you not have been casing? must she not have been casing? must we not have been casing? must you not have been casing? must they not have been casing?