Conjugaison du verbe anglais COULD UNDERTAIN

I could undertain
you could undertain
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we could undertain
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they could undertain

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they could have undertained

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I could not undertain
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they could not undertain

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I could not have undertained
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you could not have undertained
they could not have undertained

I could not have been undertaining
you could not have been undertaining
he could not have been undertaining
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they could not have been undertaining

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