Conjugaison du verbe anglais COULD PROMISE

I could promise
you could promise
he could promise
we could promise
you could promise
they could promise

I could be promising
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we could be promising
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they could be promising

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we could have promised
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they could have promised

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you could have been promising
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I could not promise
you could not promise
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I could not have promised
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we could not have promised
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I could not have been promising
you could not have been promising
he could not have been promising
we could not have been promising
you could not have been promising
they could not have been promising

could I promise?
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could I not promise?
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could I not have been promising?
could you not have been promising?
could he not have been promising?
could we not have been promising?
could you not have been promising?
could they not have been promising?