English verb conjugation MUST TIFF

Regular verb: tiff - tiffed - tiffed

Affirmation

Simple form

I must tiff
you must tiff
she must tiff
we must tiff
you must tiff
they must tiff

V-ing form

I must be tiffing
you must be tiffing
she must be tiffing
we must be tiffing
you must be tiffing
they must be tiffing

Perfect

I must have tiffed
you must have tiffed
she must have tiffed
we must have tiffed
you must have tiffed
they must have tiffed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I tiff?
must you tiff?
must she tiff?
must we tiff?
must you tiff?
must they tiff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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