English verb conjugation MUST SPIFF

Regular verb: spiff - spiffed - spiffed

Affirmation

Simple form

I must spiff
you must spiff
he must spiff
we must spiff
you must spiff
they must spiff

V-ing form

I must be spiffing
you must be spiffing
he must be spiffing
we must be spiffing
you must be spiffing
they must be spiffing

Perfect

I must have spiffed
you must have spiffed
he must have spiffed
we must have spiffed
you must have spiffed
they must have spiffed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I spiff?
must you spiff?
must he spiff?
must we spiff?
must you spiff?
must they spiff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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