female gender | Modal : no | may | might | can | could | shall | should | will | would | must | ought to
English verb conjugation MUST COST
Irregular verb: cost - cost - cost
Affirmation
Simple form
I must costyou must cost
he must cost
we must cost
you must cost
they must cost
V-ing form
I must be costingyou must be costing
he must be costing
we must be costing
you must be costing
they must be costing
Perfect
I must have costyou 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 costingyou 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 costyou 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 costingyou 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 costyou 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 costingyou 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?