English verb conjugation MUST REF

Regular verb: ref - refed - refed

Affirmation

Simple form

I must ref
you must ref
she must ref
we must ref
you must ref
they must ref

V-ing form

I must be refing
you must be refing
she must be refing
we must be refing
you must be refing
they must be refing

Perfect

I must have refed
you must have refed
she must have refed
we must have refed
you must have refed
they must have refed

V-ing perfect

I must have been refing
you must have been refing
she must have been refing
we must have been refing
you must have been refing
they must have been refing

Negation

Simple form

I mustn't ref
you mustn't ref
she mustn't ref
we mustn't ref
you mustn't ref
they mustn't ref

V-ing form

I mustn't be refing
you mustn't be refing
she mustn't be refing
we mustn't be refing
you mustn't be refing
they mustn't be refing

Perfect

I mustn't have refed
you mustn't have refed
she mustn't have refed
we mustn't have refed
you mustn't have refed
they mustn't have refed

V-ing perfect

I mustn't have been refing
you mustn't have been refing
she mustn't have been refing
we mustn't have been refing
you mustn't have been refing
they mustn't have been refing

Interrogative form

Simple form

must I ref?
must you ref?
must she ref?
must we ref?
must you ref?
must they ref?

V-ing form

must I be refing?
must you be refing?
must she be refing?
must we be refing?
must you be refing?
must they be refing?

Perfect

must I have refed?
must you have refed?
must she have refed?
must we have refed?
must you have refed?
must they have refed?

V-ing perfect

must I have been refing?
must you have been refing?
must she have been refing?
must we have been refing?
must you have been refing?
must they have been refing?

Interro-negative form

Simple form

mustn't I ref?
mustn't you ref?
mustn't she ref?
mustn't we ref?
mustn't you ref?
mustn't they ref?

V-ing form

mustn't I be refing?
mustn't you be refing?
mustn't she be refing?
mustn't we be refing?
mustn't you be refing?
mustn't they be refing?

Perfect

mustn't I have refed?
mustn't you have refed?
mustn't she have refed?
mustn't we have refed?
mustn't you have refed?
mustn't they have refed?

V-ing perfect

mustn't I have been refing?
mustn't you have been refing?
mustn't she have been refing?
mustn't we have been refing?
mustn't you have been refing?
mustn't they have been refing?

Page top