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Questions & Answers about Niye ağlıyorsun?
Why does the verb "ağlıyorsun" have an "ı" instead of an "a" from the root "ağlamak"?
The dictionary form of the verb is ağlamak (to cry), so the root is ağla. When a verb root ends in a wide vowel like a or e, and you add the present continuous suffix -ıyor, that final vowel changes (or "narrows") to match the suffix. So, ağla + ıyor becomes ağlıyor.
Is there a difference between niye and neden?
Both niye and neden mean "why" and you can use them interchangeably in almost all everyday situations. Niye is very common in spoken Turkish, while neden can sometimes sound just slightly more formal.
How do we know it means "you are crying" if the word "sen" (you) isn't there?
In Turkish, the ending of the verb tells you who is doing the action. The suffix -sun at the end of ağlıyorsun specifically means "you" (singular and informal). Because of this, the pronoun sen is usually left out unless you really want to emphasize it.