The negative form of could is could not or couldn't. To form the negative of be able to, you either put not or another negative word in front of able, or you use the expression be unable to. Master the word could in english:

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She could have learned swahili, but she didn't want to. Definition of could modal verb in oxford advanced learner's dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Could i borrow your pen? Could we see her now, please? Could i have some more pudding? Could i use your bathroom, please?

Could we see her now, please? Could i have some more pudding? Could i use your bathroom, please? Could i leave the children with you this morning? The meaning of could is β€”used in auxiliary function in the past, in the past conditional, and as an alternative to can suggesting less force or certainty or as a polite form in the present. Please could you explain why you're so late. If you could get that report.

Please could you explain why you're so late. If you could get that report.