I agree with FumbleFingers; I feel like "could you" would be almost too polite and create …
Could you explain it to me (if you weren't doing something else right now)? If we mean to use …
Could you please lend me your pen? All of them are polite requests. In general: could you …
No. Both are 100% grammatically correct and natural. While "could you" can mean "would …
If you say the cat might/may/could be dead you are not 100% certain. If you say the cat can be …
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