Could - Expresses possibility or past ability., Couldn’t - Shows inability or impossibility., Could have - Refers to something that was possible in the past but didn’t happen., Couldn’t have - Indicates that something was impossible in the past., Could you - Used to make polite requests or offers., I could use  - Means something would be helpful or needed., It could be - Expresses a guess or possibility., I wish I could - Expresses a desire to be able to do something., Could it be - Used to suggest or question a possibility., As best as I could - Means doing something as well as possible.,

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