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I have used a sentence today like below but not sure I used if so correctly here;

Additionally, we could make your booking via e-mail if you prefer to proceed that way. Please let us know if so.

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up vote 7 down vote accepted

I would just move this around slightly:

...we could make your booking via e-mail if you prefer to proceed that way; if so, please let us know.

Or, you could re-word to get the same meaning:

...if you prefer, upon request we could make your booking via e-mail.

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the first one is a good example for me. I was thinking to open another question about the usage of semi-colon ;. Now I see it can be used in sentences in English. – tugberk Jun 16 '11 at 13:17
@tugberk: The Oatmeal to the rescue... – Tragicomic Jun 16 '11 at 14:29
@Tragicomic hehe :) I wasn't aware of that website. thanks ! – tugberk Jun 16 '11 at 14:33

You used it correctly.

There is a slight addition I would implement to make it clearer:

Please let us know if it is so.

That way, there can be no misunderstanding.

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ok but it raises another question : which one is correct? If it is so or if so? – tugberk Jun 16 '11 at 13:15
@tugberk - they're semantically identical; "if so" is simply a shorter form, while "if it is so" or "if this is so" is longer but maybe a little clearer depending on context. – KeithS Jun 16 '11 at 14:48

protected by RegDwigнt Nov 29 '12 at 9:45

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