English verb conjugation MUST CASE

Regular verb: case - cased - cased

Affirmation

Simple form

I must case
you must case
she must case
we must case
you must case
they must case

V-ing form

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

I must have cased
you must have cased
she must have cased
we must have cased
you must have cased
they must have cased

V-ing perfect

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

I mustn't case
you mustn't case
she mustn't case
we mustn't case
you mustn't case
they mustn't case

V-ing form

I mustn't be casing
you mustn't be casing
she mustn't be casing
we mustn't be casing
you mustn't be casing
they mustn't be casing

Perfect

I mustn't have cased
you mustn't have cased
she mustn't have cased
we mustn't have cased
you mustn't have cased
they mustn't have cased

V-ing perfect

I mustn't have been casing
you mustn't have been casing
she mustn't have been casing
we mustn't have been casing
you mustn't have been casing
they mustn't have been casing

Interrogative form

Simple form

must I case?
must you case?
must she case?
must we case?
must you case?
must they case?

V-ing form

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

must I have cased?
must you have cased?
must she have cased?
must we have cased?
must you have cased?
must they have cased?

V-ing perfect

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

mustn't I case?
mustn't you case?
mustn't she case?
mustn't we case?
mustn't you case?
mustn't they case?

V-ing form

mustn't I be casing?
mustn't you be casing?
mustn't she be casing?
mustn't we be casing?
mustn't you be casing?
mustn't they be casing?

Perfect

mustn't I have cased?
mustn't you have cased?
mustn't she have cased?
mustn't we have cased?
mustn't you have cased?
mustn't they have cased?

V-ing perfect

mustn't I have been casing?
mustn't you have been casing?
mustn't she have been casing?
mustn't we have been casing?
mustn't you have been casing?
mustn't they have been casing?

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