English verb conjugation COULD SPIFF

Regular verb: spiff - spiffed - spiffed

Affirmation

Simple form

I could spiff
you could spiff
she could spiff
we could spiff
you could spiff
they could spiff

V-ing form

I could be spiffing
you could be spiffing
she could be spiffing
we could be spiffing
you could be spiffing
they could be spiffing

Perfect

I could have spiffed
you could have spiffed
she could have spiffed
we could have spiffed
you could have spiffed
they could have spiffed

V-ing perfect

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

Negation

Simple form

I could not spiff
you could not spiff
she could not spiff
we could not spiff
you could not spiff
they could not spiff

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I spiff?
could you spiff?
could she spiff?
could we spiff?
could you spiff?
could they spiff?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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