Which is most common and less common in 1) conversation, 2) a business mail. a. In case you need to return anything ~ b. If you need to return anything ~ c. If you should return anything ~ d. Should

karlalou.s

Which is most common and less common in 1) conversation, 2) a business mail. a. In case you need to return anything ~ b. If you need to return anything ~ c. If you should return anything ~ d. Should you return anything ~

訂正 · 2

Thank you. :)

I would say a and d are more formal and can be used in a business letter. I would use b in conversation

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