English verb conjugation COULD BIFF

Regular verb: biff - biffed - biffed

Affirmation

Simple form

I could biff
you could biff
she could biff
we could biff
you could biff
they could biff

V-ing form

I could be biffing
you could be biffing
she could be biffing
we could be biffing
you could be biffing
they could be biffing

Perfect

I could have biffed
you could have biffed
she 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
she could have been biffing
we could have been biffing
you could have been biffing
they could have been biffing

Negation

Simple form

I could not biff
you could not biff
she could not biff
we could not biff
you could not biff
they could not biff

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I biff?
could you biff?
could she biff?
could we biff?
could you biff?
could they biff?

V-ing form

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

Perfect

could I have biffed?
could you have biffed?
could she 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 she have been biffing?
could we have been biffing?
could you have been biffing?
could they have been biffing?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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