Particle (이)나 OR

* You'll add 이나 or 나 after the word to make sense 'or'. Yes, its meaning is 'or'. The tail 이나 goes with the words that ending in CONSONANT. Hence the tail 나 will go with the words that ending in VOWEL. You will see this rule more clearly in examples below.
1. 차나 쥬스를 드실래요? Would u like tea or juice?

쥬스 juice

2. 차나 드실래요? Would u like tea or something?
3. 김치탕이나 갈비 드실래요? Would u like kimchi soup or kalbi?
4. 개나 고양이를(cat) 보셨어요? Did u see a dog or a cat?
5. 수학(math)이나 공부하실거에요? Are u gonna study math or something?
6. 기차(train)나 버스(bus)를 타실 거에요? Are u gonna ride the train or the bus? (!)