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 must not tiff
you must not tiff
she must not tiff
we must not tiff
you must not tiff
they must not tiff

V-ing form

I must not be tiffing
you must not be tiffing
she must not be tiffing
we must not be tiffing
you must not be tiffing
they must not be tiffing

Perfect

I must not have tiffed
you must not have tiffed
she must not have tiffed
we must not have tiffed
you must not have tiffed
they must not have tiffed

V-ing perfect

I must not have been tiffing
you must not have been tiffing
she must not have been tiffing
we must not have been tiffing
you must not have been tiffing
they must not 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

must I not tiff?
must you not tiff?
must she not tiff?
must we not tiff?
must you not tiff?
must they not tiff?

V-ing form

must I not be tiffing?
must you not be tiffing?
must she not be tiffing?
must we not be tiffing?
must you not be tiffing?
must they not be tiffing?

Perfect

must I not have tiffed?
must you not have tiffed?
must she not have tiffed?
must we not have tiffed?
must you not have tiffed?
must they not have tiffed?

V-ing perfect

must I not have been tiffing?
must you not have been tiffing?
must she not have been tiffing?
must we not have been tiffing?
must you not have been tiffing?
must they not have been tiffing?

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