Conjugaison du verbe anglais COULD PREVENT

I could prevent
you could prevent
she could prevent
we could prevent
you could prevent
they could prevent

I could be preventing
you could be preventing
she could be preventing
we could be preventing
you could be preventing
they could be preventing

I could have prevented
you could have prevented
she could have prevented
we could have prevented
you could have prevented
they could have prevented

I could have been preventing
you could have been preventing
she could have been preventing
we could have been preventing
you could have been preventing
they could have been preventing

I could not prevent
you could not prevent
she could not prevent
we could not prevent
you could not prevent
they could not prevent

I could not be preventing
you could not be preventing
she could not be preventing
we could not be preventing
you could not be preventing
they could not be preventing

I could not have prevented
you could not have prevented
she could not have prevented
we could not have prevented
you could not have prevented
they could not have prevented

I could not have been preventing
you could not have been preventing
she could not have been preventing
we could not have been preventing
you could not have been preventing
they could not have been preventing

could I prevent?
could you prevent?
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could I not prevent?
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could they not be preventing?

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could they not have prevented?

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could you not have been preventing?
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could we not have been preventing?
could you not have been preventing?
could they not have been preventing?