Conjugaison du verbe anglais COULD UNDERSTAND

I could understand
you could understand
she could understand
we could understand
you could understand
they could understand

I could be understanding
you could be understanding
she could be understanding
we could be understanding
you could be understanding
they could be understanding

I could have understood
you could have understood
she could have understood
we could have understood
you could have understood
they could have understood

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

I could not understand
you could not understand
she could not understand
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they could not understand

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she could not be understanding
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they could not be understanding

I could not have understood
you could not have understood
she could not have understood
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they could not have understood

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you could not have been understanding
she could not have been understanding
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they could not have been understanding

could I understand?
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