English verb conjugation MUST COST

Irregular verb: cost - cost - cost

Affirmation

Simple form

I must cost
you must cost
he must cost
we must cost
you must cost
they must cost

V-ing form

I must be costing
you must be costing
he must be costing
we must be costing
you must be costing
they must be costing

Perfect

I must have cost
you must have cost
he must have cost
we must have cost
you must have cost
they must have cost

V-ing perfect

I must have been costing
you must have been costing
he must have been costing
we must have been costing
you must have been costing
they must have been costing

Negation

Simple form

I mustn't cost
you mustn't cost
he mustn't cost
we mustn't cost
you mustn't cost
they mustn't cost

V-ing form

I mustn't be costing
you mustn't be costing
he mustn't be costing
we mustn't be costing
you mustn't be costing
they mustn't be costing

Perfect

I mustn't have cost
you mustn't have cost
he mustn't have cost
we mustn't have cost
you mustn't have cost
they mustn't have cost

V-ing perfect

I mustn't have been costing
you mustn't have been costing
he mustn't have been costing
we mustn't have been costing
you mustn't have been costing
they mustn't have been costing

Interrogative form

Simple form

must I cost?
must you cost?
must he cost?
must we cost?
must you cost?
must they cost?

V-ing form

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

Perfect

must I have cost?
must you have cost?
must he have cost?
must we have cost?
must you have cost?
must they have cost?

V-ing perfect

must I have been costing?
must you have been costing?
must he have been costing?
must we have been costing?
must you have been costing?
must they have been costing?

Interro-negative form

Simple form

mustn't I cost?
mustn't you cost?
mustn't he cost?
mustn't we cost?
mustn't you cost?
mustn't they cost?

V-ing form

mustn't I be costing?
mustn't you be costing?
mustn't he be costing?
mustn't we be costing?
mustn't you be costing?
mustn't they be costing?

Perfect

mustn't I have cost?
mustn't you have cost?
mustn't he have cost?
mustn't we have cost?
mustn't you have cost?
mustn't they have cost?

V-ing perfect

mustn't I have been costing?
mustn't you have been costing?
mustn't he have been costing?
mustn't we have been costing?
mustn't you have been costing?
mustn't they have been costing?

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