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 mustn't undertake
you mustn't undertake
he mustn't undertake
we mustn't undertake
you mustn't undertake
they mustn't undertake

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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