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Definitions from the Web

Couldn

Part of Speech: Verb

Sense 1: (past of "cannot") Used to indicate the inability to do something.

Example Sentence: I couldn't find my keys, so I had to borrow my sister's.

Sense 2: (informal) Used as a negative response to a request for permission or a suggestion.

Example Sentence: "Can I borrow your car?" - "I couldn't let you, as it's currently being repaired."

Sense 3: (archaic) Potential form of the verb "can."

Example Sentence: The young boy couldn't swim on his own yet, but he was learning.

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