Conjugaison du verbe anglais COULD FORM

I could form
you could form
he could form
we could form
you could form
they could form

I could be forming
you could be forming
he could be forming
we could be forming
you could be forming
they could be forming

I could have formed
you could have formed
he could have formed
we could have formed
you could have formed
they could have formed

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

I could not form
you could not form
he could not form
we could not form
you could not form
they could not form

I could not be forming
you could not be forming
he could not be forming
we could not be forming
you could not be forming
they could not be forming

I could not have formed
you could not have formed
he could not have formed
we could not have formed
you could not have formed
they could not have formed

I could not have been forming
you could not have been forming
he could not have been forming
we could not have been forming
you could not have been forming
they could not have been forming

could I form?
could you form?
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could I not form?
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could they not be forming?

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could you not have been forming?
could they not have been forming?