English verb conjugation MUST COUNTERCHECK

Regular verb: countercheck - counterchecked - counterchecked

Affirmation

Simple form

I must countercheck
you must countercheck
he must countercheck
we must countercheck
you must countercheck
they must countercheck

V-ing form

I must be counterchecking
you must be counterchecking
he must be counterchecking
we must be counterchecking
you must be counterchecking
they must be counterchecking

Perfect

I must have counterchecked
you must have counterchecked
he must have counterchecked
we must have counterchecked
you must have counterchecked
they must have counterchecked

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I countercheck?
must you countercheck?
must he countercheck?
must we countercheck?
must you countercheck?
must they countercheck?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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