English verb conjugation MUST COUNTERSINK

Irregular verb: countersink - countersank - countersunk

Affirmation

Simple form

I must countersink
you must countersink
she must countersink
we must countersink
you must countersink
they must countersink

V-ing form

I must be countersinking
you must be countersinking
she must be countersinking
we must be countersinking
you must be countersinking
they must be countersinking

Perfect

I must have countersunk
you must have countersunk
she must have countersunk
we must have countersunk
you must have countersunk
they must have countersunk

V-ing perfect

I must have been countersinking
you must have been countersinking
she must have been countersinking
we must have been countersinking
you must have been countersinking
they must have been countersinking

Negation

Simple form

I must not countersink
you must not countersink
she must not countersink
we must not countersink
you must not countersink
they must not countersink

V-ing form

I must not be countersinking
you must not be countersinking
she must not be countersinking
we must not be countersinking
you must not be countersinking
they must not be countersinking

Perfect

I must not have countersunk
you must not have countersunk
she must not have countersunk
we must not have countersunk
you must not have countersunk
they must not have countersunk

V-ing perfect

I must not have been countersinking
you must not have been countersinking
she must not have been countersinking
we must not have been countersinking
you must not have been countersinking
they must not have been countersinking

Interrogative form

Simple form

must I countersink?
must you countersink?
must she countersink?
must we countersink?
must you countersink?
must they countersink?

V-ing form

must I be countersinking?
must you be countersinking?
must she be countersinking?
must we be countersinking?
must you be countersinking?
must they be countersinking?

Perfect

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

V-ing perfect

must I have been countersinking?
must you have been countersinking?
must she have been countersinking?
must we have been countersinking?
must you have been countersinking?
must they have been countersinking?

Interro-negative form

Simple form

must I not countersink?
must you not countersink?
must she not countersink?
must we not countersink?
must you not countersink?
must they not countersink?

V-ing form

must I not be countersinking?
must you not be countersinking?
must she not be countersinking?
must we not be countersinking?
must you not be countersinking?
must they not be countersinking?

Perfect

must I not have countersunk?
must you not have countersunk?
must she not have countersunk?
must we not have countersunk?
must you not have countersunk?
must they not have countersunk?

V-ing perfect

must I not have been countersinking?
must you not have been countersinking?
must she not have been countersinking?
must we not have been countersinking?
must you not have been countersinking?
must they not have been countersinking?

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