English verb conjugation MUST CASE

Regular verb: case - cased - cased

Affirmation

Simple form

I must case
you must case
he must case
we must case
you must case
they must case

V-ing form

I must be casing
you must be casing
he must be casing
we must be casing
you must be casing
they must be casing

Perfect

I must have cased
you must have cased
he 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
he 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
he 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
he 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
he 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
he 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 he case?
must we case?
must you case?
must they case?

V-ing form

must I be casing?
must you be casing?
must he be casing?
must we be casing?
must you be casing?
must they be casing?

Perfect

must I have cased?
must you have cased?
must he 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 he 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 he 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 he 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 he 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 he 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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