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 could not tiff
you could not tiff
she could not tiff
we could not tiff
you could not tiff
they could not tiff

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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