Conjugação do verbo inglês COULD PRESENT

I could present
you could present
he could present
we could present
you could present
they could present

I could be presenting
you could be presenting
he could be presenting
we could be presenting
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they could be presenting

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you could have presented
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you could have presented
they could have presented

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you could have been presenting
they could have been presenting

I could not present
you could not present
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you could not present
they could not present

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you could not be presenting
he could not be presenting
we could not be presenting
you could not be presenting
they could not be presenting

I could not have presented
you could not have presented
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we could not have presented
you could not have presented
they could not have presented

I could not have been presenting
you could not have been presenting
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we could not have been presenting
you could not have been presenting
they could not have been presenting

could I present?
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could they not have presented?

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could they not have been presenting?