Conjugaison du verbe anglais COULD EXCHANGE

I could exchange
you could exchange
he could exchange
we could exchange
you could exchange
they could exchange

I could be exchanging
you could be exchanging
he could be exchanging
we could be exchanging
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they could be exchanging

I could have exchanged
you could have exchanged
he could have exchanged
we could have exchanged
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they could have exchanged

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you could have been exchanging
he could have been exchanging
we could have been exchanging
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they could have been exchanging

I could not exchange
you could not exchange
he could not exchange
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you could not exchange
they could not exchange

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he could not be exchanging
we could not be exchanging
you could not be exchanging
they could not be exchanging

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

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they could not have been exchanging

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could they not be exchanging?

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could they not have exchanged?

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