English verb conjugation MUST FIRM

Regular verb: firm - firmed - firmed

Affirmation

Simple form

I must firm
you must firm
he must firm
we must firm
you must firm
they must firm

V-ing form

I must be firming
you must be firming
he must be firming
we must be firming
you must be firming
they must be firming

Perfect

I must have firmed
you must have firmed
he must have firmed
we must have firmed
you must have firmed
they must have firmed

V-ing perfect

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

Negation

Simple form

I must not firm
you must not firm
he must not firm
we must not firm
you must not firm
they must not firm

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I firm?
must you firm?
must he firm?
must we firm?
must you firm?
must they firm?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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