Learn English – Can ‘why’ act as a relative pronoun

grammarrelative-clausesrelative-pronouns

Please consider the following two main clauses.

Both variables have the same range of values. Therefore, a 4:3 aspect ratio has been chosen.

I would like to combine these two main clauses into one sentence containing a main clause and a relative subclause like this:

Both variables have the same range of values why a 4:3 aspect ratio has been chosen.

Is this grammatically correct? I could not find an authoritive answer on the web. While this page mentions why as a relative pronoun, it does not give an example. In contrast, Wikipedia does not mention it as relative pronoun at all.

If my second sentence is grammatically incorrect, could you suggest a way to rephrase it?

Best Answer

Your second sentence is not grammatically correct. You could say

Both variables have the same range of values, which is why a 4:3 aspect ratio has been chosen.

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