Conjugaison du verbe anglais COULD EXCHANGE

I could exchange
you could exchange
she could exchange
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you could exchange
they could exchange

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you could be exchanging
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they could be exchanging

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they could have exchanged

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they could have been exchanging

I could not exchange
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they could not exchange

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she could not be exchanging
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they could not be exchanging

I could not have exchanged
you could not have exchanged
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they could not have been exchanging

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could they not have exchanged?

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could you not have been exchanging?
could she not have been exchanging?
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could they not have been exchanging?