1. 내일 영화를 보는건가요? 2. 내일 영화를 봐요? 3. 내일 영화를 볼 거에요? 4. 내일 영화를 볼까요?(lets see a movie?) 5. 내일 영화를 보나요? Yeaah... its hard to understand. all are same but,, a little bit makes different feelings..

1. 내일 영화를 보는 건가요? - somewhat formal and detached. -는 건가요? (것인가요?, from 것이다 + -ㄴ가요?) is often used to ask about a fact, plan or rule already in place. It is not a good way to ask a personal question in daily conversation. 2.내일 영화를 봐요? - casual speech, but slightly unclear about who. '봐요' is in present tense, but it can express the (near) future if such an adverb is present(내일 here). 3.내일 영화를 볼 거예요? - natural. It's a common way of asking about the other person's plan in the future. -ㄹ 것이다 is the proper way of expressing an action in the future tense. 4.내일 영화를 볼까요? - "Shall we watch a movie tomorrow?". -ㄹ까(요)? has two usages: 1) Shall we (do something) together? (as in this example), 2) ask a question in a cautious way (i.e. about things about which the other person can only have an opinion). 5.내일 영화를 보나요? - sounds like a question about public matters. -나요? is nowadays used mostly in a public setting or in a question to oneself, somewhat similar to -ㄹ까요?. It is often used to ask something to a store clerk, for example. -나? without 요 usually asks a self-directed question, like wondering to oneself ("왜 이렇게 안 오나?") So #1, #2, and #5 are somewhat unclear or unnatural, partly becuase the endings don't make the subject clear. -ㄹ 거예요? typically suggests "you" as the subject, and -ㄹ까요? "us" (the speaker and the listener), so #3 and #4 sound the most natural.