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I have been given the following section, and I need to identify the grammatical errors.

Improving quality involves being aware of what your customers are looking for, as well as continually making that product better so you not only keep your customers but also gain more.

Should a comma be placed before the conjunction "so"?

If yes, why?

Should "but also" be replaced by "but you also"?

Kindly explain

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jhilly89Should a comma be placed before the conjunction "so"?

It depends what the author is trying to say. Without the comma, the "you not only ..." part is the result of "making that product better" only. With the comma, it is the result of both the things mentioned.

jhilly89Should "but also" be replaced by "but you also"?

Logically I would say the second "you" is not required since "gain more" is still under the scope of the first "you". In practice, people might add the second "you" and it would not stand out as an error.

For reasons not directly connected with your questions, it is not the greatest sentence ever written, in my opinion. For one thing, "gain more", which is presumably supposed to mean "gain more customers", can be misread. Also, the statement that "improving quality" entails "making that product better" seems to contain little actual information.

Comments  
jhilly89Should a comma be placed before the conjunction "so"?

No. Its clause goes with the idea of making it better.

jhilly89Should "but also" be replaced by "but you also"?

No. "Not only/but also" are a matched set.