English verb conjugation MUST UNDERSTUDY

Regular verb: understudy - understudied - understudied

Affirmation

Simple form

I must understudy
you must understudy
he must understudy
we must understudy
you must understudy
they must understudy

V-ing form

I must be understudying
you must be understudying
he must be understudying
we must be understudying
you must be understudying
they must be understudying

Perfect

I must have understudied
you must have understudied
he must have understudied
we must have understudied
you must have understudied
they must have understudied

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I understudy?
must you understudy?
must he understudy?
must we understudy?
must you understudy?
must they understudy?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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