👉 The term "couldn't" is a phrase used to express disbelief or surprise. It is often used in conversation when someone cannot do something that they would normally expect or wish for, such as being unable to find the right answer to a question or not succeeding in a task. The word "couldn't" is typically followed by a subject and verb, with the subject usually asking the question or expressing surprise. For example: - "Could you please lend me that book?" - A person expresses disbelief