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 must not crumble
you must not crumble
he must not crumble
we must not crumble
you must not crumble
they must not crumble

V-ing form

I must not be crumbling
you must not be crumbling
he must not be crumbling
we must not be crumbling
you must not be crumbling
they must not be crumbling

Perfect

I must not have crumbled
you must not have crumbled
he must not have crumbled
we must not have crumbled
you must not have crumbled
they must not have crumbled

V-ing perfect

I must not have been crumbling
you must not have been crumbling
he must not have been crumbling
we must not have been crumbling
you must not have been crumbling
they must not 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

must I not crumble?
must you not crumble?
must he not crumble?
must we not crumble?
must you not crumble?
must they not crumble?

V-ing form

must I not be crumbling?
must you not be crumbling?
must he not be crumbling?
must we not be crumbling?
must you not be crumbling?
must they not be crumbling?

Perfect

must I not have crumbled?
must you not have crumbled?
must he not have crumbled?
must we not have crumbled?
must you not have crumbled?
must they not have crumbled?

V-ing perfect

must I not have been crumbling?
must you not have been crumbling?
must he not have been crumbling?
must we not have been crumbling?
must you not have been crumbling?
must they not have been crumbling?

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