Questions & Answers about Neden olmasın, zaten hava çok güzel.
What does Neden olmasın literally mean, and how is it built?
It literally means Why should it not be? or Why shouldn’t it happen?
Breakdown: neden = why; ol- = be/happen; -ma- = negative; -sın = 3rd-person optative/imperative (“let it (not) be”). So ol-ma-sın = “let it not be,” and the whole phrase is a set way to say “Why not?”
Why isn’t the yes/no question particle mi/ mı/ mu/ mü used here?
Because neden already makes it a wh-question. Mi is for yes/no questions. You could say Olmasın mı? (“Shouldn’t it be?”) to seek confirmation, but it’s not the same as the idiomatic, agreeable Neden olmasın?. Avoid Neden olmasın mı?, which is awkward.
Can I replace neden with niye or niçin?
Yes. Niye olmasın? is more colloquial; Neden olmasın? is neutral; Niçin olmasın? is a bit formal/literary. All mean “Why not?”
What is the subject of olmasın? What is the “it”?
Turkish often leaves the subject implicit. Olmasın is 3rd person and refers to the proposed action or idea from context (e.g., “sit outside,” “go out,” “have coffee”). So it’s an impersonal “it.”
What does zaten mean here?