English verb conjugation COULD TIFF

Regular verb: tiff - tiffed - tiffed

Affirmation

Simple form

I could tiff
you could tiff
she could tiff
we could tiff
you could tiff
they could tiff

V-ing form

I could be tiffing
you could be tiffing
she could be tiffing
we could be tiffing
you could be tiffing
they could be tiffing

Perfect

I could have tiffed
you could have tiffed
she could have tiffed
we could have tiffed
you could have tiffed
they could have tiffed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I tiff?
could you tiff?
could she tiff?
could we tiff?
could you tiff?
could they tiff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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