English verb conjugation MUST UNDERTAIN

Regular verb: undertain - undertained - undertained

Affirmation

Simple form

I must undertain
you must undertain
he must undertain
we must undertain
you must undertain
they must undertain

V-ing form

I must be undertaining
you must be undertaining
he must be undertaining
we must be undertaining
you must be undertaining
they must be undertaining

Perfect

I must have undertained
you must have undertained
he must have undertained
we must have undertained
you must have undertained
they must have undertained

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I undertain?
must you undertain?
must he undertain?
must we undertain?
must you undertain?
must they undertain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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