English verb conjugation COULD BIFF

Regular verb: biff - biffed - biffed

Affirmation

Simple form

I could biff
you could biff
he could biff
we could biff
you could biff
they could biff

V-ing form

I could be biffing
you could be biffing
he could be biffing
we could be biffing
you could be biffing
they could be biffing

Perfect

I could have biffed
you could have biffed
he could have biffed
we could have biffed
you could have biffed
they could have biffed

V-ing perfect

I could have been biffing
you could have been biffing
he could have been biffing
we could have been biffing
you could have been biffing
they could have been biffing

Negation

Simple form

I couldn't biff
you couldn't biff
he couldn't biff
we couldn't biff
you couldn't biff
they couldn't biff

V-ing form

I couldn't be biffing
you couldn't be biffing
he couldn't be biffing
we couldn't be biffing
you couldn't be biffing
they couldn't be biffing

Perfect

I couldn't have biffed
you couldn't have biffed
he couldn't have biffed
we couldn't have biffed
you couldn't have biffed
they couldn't have biffed

V-ing perfect

I couldn't have been biffing
you couldn't have been biffing
he couldn't have been biffing
we couldn't have been biffing
you couldn't have been biffing
they couldn't have been biffing

Interrogative form

Simple form

could I biff?
could you biff?
could he biff?
could we biff?
could you biff?
could they biff?

V-ing form

could I be biffing?
could you be biffing?
could he be biffing?
could we be biffing?
could you be biffing?
could they be biffing?

Perfect

could I have biffed?
could you have biffed?
could he have biffed?
could we have biffed?
could you have biffed?
could they have biffed?

V-ing perfect

could I have been biffing?
could you have been biffing?
could he have been biffing?
could we have been biffing?
could you have been biffing?
could they have been biffing?

Interro-negative form

Simple form

couldn't I biff?
couldn't you biff?
couldn't he biff?
couldn't we biff?
couldn't you biff?
couldn't they biff?

V-ing form

couldn't I be biffing?
couldn't you be biffing?
couldn't he be biffing?
couldn't we be biffing?
couldn't you be biffing?
couldn't they be biffing?

Perfect

couldn't I have biffed?
couldn't you have biffed?
couldn't he have biffed?
couldn't we have biffed?
couldn't you have biffed?
couldn't they have biffed?

V-ing perfect

couldn't I have been biffing?
couldn't you have been biffing?
couldn't he have been biffing?
couldn't we have been biffing?
couldn't you have been biffing?
couldn't they have been biffing?

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