Conjugaison du verbe anglais COULD LISTEN

I could listen
you could listen
he could listen
we could listen
you could listen
they could listen

I could be listening
you could be listening
he could be listening
we could be listening
you could be listening
they could be listening

I could have listened
you could have listened
he could have listened
we could have listened
you could have listened
they could have listened

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you could have been listening
he could have been listening
we could have been listening
you could have been listening
they could have been listening

I could not listen
you could not listen
he could not listen
we could not listen
you could not listen
they could not listen

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

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

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

could I listen?
could you listen?
could he listen?
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could they listen?

could I be listening?
could you be listening?
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could they be listening?

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could you have listened?
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could they have listened?

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could I not listen?
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could they not have been listening?