neoneun wae yeonghwareul boji anha?

Literally, it breaks down as:

• 너는 (you-TOPIC)
• 왜 (why)
• 영화를 (movie-OBJECT)
• 보지 (watch-NEG-stem)
• 않아? (do not)
  So the word order is Topic + Adverb + Object + Verb. The English equivalent word order would be “As for you, why don’t you watch a movie?”, which we naturally say as “Why don’t you watch a movie?”

너는 = 너 (you) + 는 (topic marker).
In Korean, you often attach particles to show each word’s role:

• 는/은 marks the topic.
  Without it, 너 would be understood as “you,” but adding 는 highlights “as for you…” and sets the context for the rest of the sentence.

Korean is an SOV (Subject-Object-Verb) language:

• Subject/Topic → Object → Verb
  English is SVO (Subject-Verb-Object). That’s why 보지 않아 (don’t watch) comes at the end in Korean.

보지 않아 comes from the verb 보다 (to watch):

1. Drop the 다 from 보다, you get the stem 보.
2. Attach -지 to form 보지. This is the “negative verb stem” when using 않다.
3. Add 않다 after it, and conjugate 않다 to 않아 (informal).
   Full pattern: verb stem + -지
   • 않다 → verb stem + 지 않아.

Yes, 안 봐? is a perfectly natural, even more casual way. Differences:

• 안
  • verb = simple negation.
• -지 않다 = slightly more formal/literary or emphasizes the negative.
  So
• 너는 왜 안 봐? (Why aren’t you watching [it]?)
• 너는 왜 보지 않아? (Why don’t you watch [it]?)
  Both mean the same, but 안 봐 is more conversational.

It’s in 반말 (informal/casual speech) because:

• The verb ending -아/어? without any honorific suffix.
• Using 너 instead of 당신 or a name + 씨.
  It’s fine among close friends or younger people, but can be too blunt for strangers or elders.

Yes. Korean often drops the topic/subject if it’s clear from context.

• 왜 영화를 보지 않아? (Why don’t you watch a movie?)
  This is perfectly natural when it’s obvious you’re talking to the person in question.

Yes, you can.

• 영화를 왜 보지 않아? puts slight emphasis on 영화 (the movie).
• 너는 왜 영화를 보지 않아? emphasizes you.
  Both mean “Why don’t you watch the movie?” but focus shifts depending on what comes first.