Conjugaison du verbe anglais COULD PREVENT

I could prevent
you could prevent
he could prevent
we could prevent
you could prevent
they could prevent

I could be preventing
you could be preventing
he could be preventing
we could be preventing
you could be preventing
they could be preventing

I could have prevented
you could have prevented
he 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
he 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
he 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
he 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
he 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
he 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?
could he prevent?
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could they prevent?

could I be preventing?
could you be preventing?
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could they have prevented?

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

could I not have prevented?
could you not have prevented?
could he not have prevented?
could we not have prevented?
could you not have prevented?
could they not have prevented?

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