English verb conjugation MUST STUMBLE

Regular verb: stumble - stumbled - stumbled

Affirmation

Simple form

I must stumble
you must stumble
he must stumble
we must stumble
you must stumble
they must stumble

V-ing form

I must be stumbling
you must be stumbling
he must be stumbling
we must be stumbling
you must be stumbling
they must be stumbling

Perfect

I must have stumbled
you must have stumbled
he must have stumbled
we must have stumbled
you must have stumbled
they must have stumbled

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I stumble?
must you stumble?
must he stumble?
must we stumble?
must you stumble?
must they stumble?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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