" I am getting conflicting advice and am now totally confused I assume you are probably talking about a business letter rather than a personal one. That's because both of these, while not wrong, sound very formal and to my ear even rather old-fashioned. I'd say eg I would be grateful if you would/could send me details .
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CliveAssume you visit your friend, and she offers you a drink.
It's not polite to say 'I want a Coke'. The sentence feels too strong. It sounds like it will be a big problem if she doe not have a Coke in the fridge.
Instead, we typically say 'I would like a Coke'. This does not seem so strong.
It seems more conditional, more like you are saying 'If y