English verb conjugation COULD CURTAIN

Regular verb: curtain - curtained - curtained

Affirmation

Simple form

I could curtain
you could curtain
he could curtain
we could curtain
you could curtain
they could curtain

V-ing form

I could be curtaining
you could be curtaining
he could be curtaining
we could be curtaining
you could be curtaining
they could be curtaining

Perfect

I could have curtained
you could have curtained
he could have curtained
we could have curtained
you could have curtained
they could have curtained

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I curtain?
could you curtain?
could he curtain?
could we curtain?
could you curtain?
could they curtain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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