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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 ~

Corrections · 2

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Thank you. :)
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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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