English verb conjugation COULD SKI

Regular verb: ski - skied - skied

Affirmation

Simple form

I could ski
you could ski
he could ski
we could ski
you could ski
they could ski

V-ing form

I could be skiing
you could be skiing
he could be skiing
we could be skiing
you could be skiing
they could be skiing

Perfect

I could have skied
you could have skied
he could have skied
we could have skied
you could have skied
they could have skied

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I ski?
could you ski?
could he ski?
could we ski?
could you ski?
could they ski?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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