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Only if you approve the shipping charges will we ask for your credit card details.

In the above sentence, I think will should be placed after we. Am I right? If you think the above sentence is correct then please give a reason for your answer.

Only if you approve the shipping charges we will ask for your credit card details.

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Comments  
The original sentence is fine. The inversion is caused by the presence "if." Not everybody uses it.
Should you have any questions, please don't hesitate to ask = If you have any questions, then please don't hesitate to ask.

In the above sentence should is used in the place of if. I mean if could be substituted for should. But in the following sentence I guess there is no sense in using if in the place of will, therefore I think there is no need to invert will.

Only if you approve the shipping charges will we ask for your credit card details.
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>there is no sense
If you're so sure, why ask?

The original sentence has the most elegant phrasing, not your suggested change.
The inversion comes with "Only if."

If you approve the charges, we will ship the product.

Only if you approve the charges will we ship the product.
Grammar GeekThe inversion comes with "Only if."

If you approve the charges, we will ship the product.

Only if you approve the charges will we ship the product.

Hi GG,

If we write simply if you approve the charges, we will ship the product, then there is no need for inversion. If we add only at the start of that sentence, then inversion has to take place. Why does inversion become necessary after adding only at the start of sentence?
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No one has reasons for that, IMO.

This is how the English language has developed in that respect during the time. This is the idiom, i.e. this is how how the majority of educated people speak.

A possible reason: speakers felt the need to emphasize the different circumstances introduced by only, who is more exclusive.

Practical conclusion: one is well advised to listen more and think less in terms of languages.

Hi Jackson

I agree. Doing a lot of listening and reading will help you get a "feel" for when subject-verb inversion typically occurs.
If you want to read up on this, here are a few of the sites that a Google search finds:
http://grammar.ccc.commnet.edu/grammar/subjects.htm

Hi Jackson

You are applying logic in learning English. Don't forget we are not discussing maths.
English usage is often logical, but sometimes it isn't and you just have to follow the rules. That is more important than asking why it should be like that. If you apply logic in English, there will be a lot of questions to ask. For example, why should it be "I am", not "I is" and "You are", not "You is"? Both the examples involve one person, but the verbs are different.
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