English verb conjugation MUST UNDERTAKE

Irregular verb: undertake - undertook - undertaken

Affirmation

Simple form

I must undertake
you must undertake
he must undertake
we must undertake
you must undertake
they must undertake

V-ing form

I must be undertaking
you must be undertaking
he must be undertaking
we must be undertaking
you must be undertaking
they must be undertaking

Perfect

I must have undertaken
you must have undertaken
he must have undertaken
we must have undertaken
you must have undertaken
they must have undertaken

V-ing perfect

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

Negation

Simple form

I must not undertake
you must not undertake
he must not undertake
we must not undertake
you must not undertake
they must not undertake

V-ing form

I must not be undertaking
you must not be undertaking
he must not be undertaking
we must not be undertaking
you must not be undertaking
they must not be undertaking

Perfect

I must not have undertaken
you must not have undertaken
he must not have undertaken
we must not have undertaken
you must not have undertaken
they must not have undertaken

V-ing perfect

I must not have been undertaking
you must not have been undertaking
he must not have been undertaking
we must not have been undertaking
you must not have been undertaking
they must not have been undertaking

Interrogative form

Simple form

must I undertake?
must you undertake?
must he undertake?
must we undertake?
must you undertake?
must they undertake?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

must I not undertake?
must you not undertake?
must he not undertake?
must we not undertake?
must you not undertake?
must they not undertake?

V-ing form

must I not be undertaking?
must you not be undertaking?
must he not be undertaking?
must we not be undertaking?
must you not be undertaking?
must they not be undertaking?

Perfect

must I not have undertaken?
must you not have undertaken?
must he not have undertaken?
must we not have undertaken?
must you not have undertaken?
must they not have undertaken?

V-ing perfect

must I not have been undertaking?
must you not have been undertaking?
must he not have been undertaking?
must we not have been undertaking?
must you not have been undertaking?
must they not have been undertaking?

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