Conjugaison du verbe anglais COULD PRESERVE

I could preserve
you could preserve
he could preserve
we could preserve
you could preserve
they could preserve

I could be preserving
you could be preserving
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we could be preserving
you could be preserving
they could be preserving

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they could have preserved

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I could not preserve
you could not preserve
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they could not preserve

I could not be preserving
you could not be preserving
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you could not have preserved
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they could not have been preserving

could I preserve?
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