Sometimes you hear people saying they want their work to be 100% correct. That is a very difficult target. While much of the English language is governed by widely recognised rules, those rules don’t cover everything.
Unless you are working to a very detailed style guide covering exactly what is required in a wide range of scenarios, there will be plenty of things that can be expressed in a variety of ways. The best way will depend on various factors, such as the context, the level of formality, and sometimes even the way it looks on the page.
It might be important for all the documents produced by an organisation to have a similar look and feel. If so, a style guide helps to achieve that consistency, and you can measure correctness against that target, if it covers enough detail.
This post shows how difficult it can be to find the correct form.
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