Let's learn about "내일 뭐해?"

내일 뭐해? : What are you doing tomorrow?

[other expressions]

- 내일 뭐하니? (to younger people or friends)

- 내일 뭐하냐? (to younger people or friends)

- 내일 뭐해? (to younger people or friends)

- 내일 뭐하는데? (to younger people or friends)

- 내일 뭐해요? (honourific by ‘-요’)

- 내일 뭐하는데요? (honourific by ‘-요’)

- 내일 뭐하세요? (honourific by ‘-요’)

- 내일 뭐하셔요? (honourific by ‘-요’)

- 내일 뭐합니까? (formal; honourific by ‘-ㅂ’)

- 내일 뭐하십니까? (more honourific by ‘-시’)

[explanations]

* 내일 : tomorrow

* 뭐 : a short form of 무엇(what)

* -을 : a particle makes 뭐 objective after a word ends in a vowel; this omitted

* 하다 : do

* 하는데? : 하(the stem of 하다) + -는데?(a non-honourific interrogative verb ending suffix)

* 해? : 하(the stem of 하다: 하 + -어 contracted into 해) + -어(a non-honourific interrogative verb ending suffix)

* 하세요? : 하(the stem of 하다) + -시(a suffix makes a verb more honourific) + -어(an interrogative verb ending suffix) + -요(an honouriric ending suffix)

* 하셔요? : 하(the stem of 하다) + -시(a suffix makes a verb more honourific) + -여(an interrogative verb ending suffix) + -요(an honouriric ending suffix)

* 합니까? : 하(the stem of 하다) + -ㅂ니까(an honourific interrogative verb ending suffix by ‘-ㅂ’)

* 하십니까? : 하(the stem of 하다) + -시(a suffix makes a verb more honourific) + -ㅂ니까(an honourific interrogative verb ending suffix by ‘-ㅂ’)

* a verb + -니? / -냐? / -는데?/ -어? : a non-honourific interrogative verb ending suffix

* a verb +  -는데? / -어? + -요 : an honourific verb ending suffix

* a verb + -세요? / -셔요? / -십니까? / -ㅂ니까? : an honourific interrgative verb ending suffix by ‘-시-‘ / ‘-요’