I was at one of Stack Exchange's many forums, and I came across a question that made wonder on whether I was building a sentence correctly when using the word "Why", and if that new way was right.

How I would write it:

"Why not to use a cotton base layer?"

How I saw it written:

"Why not use a cotton base layer?"

My question is, which sentence is correct, why, and if both, are they interchangeable?

  • 1
    @MorganFR Thanks, could please, if possible, explain why?
    – Kyle
    Apr 14, 2016 at 12:41
  • 2
    To be more precise, both can be said, but the first one has a whole different meaning and is probably not the one you wanna use. If you say the first one, it's to actually give a reason why you shouldn't use a cotton base layer, whereas the second suggest you might wanna use a cotton base layer. "Why not to use a cotton base layer ? Because a cotton base layer would be bad.", "Why not use a cotton base layer? Because cotton is good."
    – MorganFR
    Apr 14, 2016 at 12:45
  • @MorganFR Holy moly, that changes a lot now that I read it again it actually is different, thanks
    – Kyle
    Apr 14, 2016 at 12:55
  • 1
    @MorganFR Could you make it an answer so I can mark it as the answer?
    – Kyle
    Apr 14, 2016 at 13:23

2 Answers 2


Both sentences are correct but convey opposite messages.

"Why not to use a cotton base layer?" is a question followed by reasons why you should not use a cotton base layer (e.g. "Because a cotton base layer is no adequate.")

"Why not use a cotton base layer?" however, is a rhetorical question usually followed by reasons why you should use a cotton base layer (e.g. "Because cotton is the perfect material.")

In your original post, the second sentence is usually the one that is used, and probably the one you are looking for.

Alternatively, you could rephrase the first one : "Why should you not use a cotton base layer?", and the second one : "Why don't you use a cotton base layer?" Of course both of those can use other subjects ("Why shouldn't he", "Why don't we" etc...)

  • Thank you so much for your neat and well explained answer, nailed it
    – Kyle
    Apr 14, 2016 at 13:46
  • 2
    Unfortunately, I don't think this is right. "Why not to use a cotton base layer" isn't an interrogative; it's a relative clause: "Tell me why not to use a cotton base layer." And there's no reason that "Why not use a cotton base layer?" couldn't be a question directed at another and for which the asker expects an answer.
    – deadrat
    Apr 15, 2016 at 4:22

The first construction does not read like a real question. As mentioned in the comments, it would usually be followed by reasons why one should NOT [verb]. (Interestingly, if spoken, the word not in such a case would be emphasized, as if to cue that it's not a real question.) If the first meaning is intended, it would seem less awkward to headline with "Reasons to not use cotton base layers" or "Why you should not use cotton base layers".

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