English verb conjugation MUST CRUMBLE

Regular verb: crumble - crumbled - crumbled

Affirmation

Simple form

I must crumble
you must crumble
he must crumble
we must crumble
you must crumble
they must crumble

V-ing form

I must be crumbling
you must be crumbling
he must be crumbling
we must be crumbling
you must be crumbling
they must be crumbling

Perfect

I must have crumbled
you must have crumbled
he must have crumbled
we must have crumbled
you must have crumbled
they must have crumbled

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I crumble?
must you crumble?
must he crumble?
must we crumble?
must you crumble?
must they crumble?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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