English verb conjugation COULD SPIFF

Regular verb: spiff - spiffed - spiffed

Affirmation

Simple form

I could spiff
you could spiff
he could spiff
we could spiff
you could spiff
they could spiff

V-ing form

I could be spiffing
you could be spiffing
he could be spiffing
we could be spiffing
you could be spiffing
they could be spiffing

Perfect

I could have spiffed
you could have spiffed
he 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
he could have been spiffing
we could have been spiffing
you could have been spiffing
they could have been spiffing

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I spiff?
could you spiff?
could he spiff?
could we spiff?
could you spiff?
could they spiff?

V-ing form

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

Perfect

could I have spiffed?
could you have spiffed?
could he 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 he have been spiffing?
could we have been spiffing?
could you have been spiffing?
could they have been spiffing?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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