I have a question regarding the use of the noun why in a sentence. Is it possible to use a full stop after why? For example, are these 2 sentences correct?

That's the reason why. I chose vegetarian food.

I always knew that why can introduce a question or can be used as linked noun but someone told me that the sentence above is grammatically correct.

  • 1
    They are both acceptable (if one doesn't demand a 'proper sentence' for the first fragment). But they make as much sense as written as say 'Under the table. I chose to go swimming on Tuesday.' Jun 15, 2015 at 10:29
  • Ya don't even need to USE the word WHY. What's wrong with "That's the reason I chose vegetarian food"? Don Jun 15, 2015 at 10:41
  • I know that using "why" after "reason" is redoundant and "why"should be eliminated from the sentence. But if I decide to leave it, is it correct to end the sentence after "why"? For me it's a serius mistake, even more serius then leaving the noun.
    – Simona
    Jun 15, 2015 at 10:53
  • Your two sentences make no sense. Correct: That's the reason why I chose vegetarian food. - You should ask such questions on ELL.
    – rogermue
    Jun 15, 2015 at 10:55
  • 1
    "You ask me why I became vegetarian? I do not like meat, that is the reason why."
    – mplungjan
    Jun 15, 2015 at 11:46

1 Answer 1


Grammatically correct, though perhaps not expressing what is intended.

That's the reason why. I chose vegetarian food.

Is two separate statements. The first.

That's the reason why.

Means the same thing as "That's the reason", but the redundant why can add emphasis or stress it's connection to a question that had asked "why?" This sentence only makes sense after a reason has been given.

I chose vegetarian food.

States that you chose such food. It doesn't really relate to the previous sentence, unless perhaps underlining it or adding to it. E.g.:

Why did you not try the speciality?

The meat dishes all had sauces with chilli in them, and I'm allergic to chilli. That's the reason why. I chose vegetarian food.

First we've the explanation, then the "that's the reason why", and then the final sentence adds separate information.


That's the reason why I chose vegetarian food.

Says of the previous statement not just "that's the reason" but "that's the reason for choosing vegetarian food.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.