我不知道你為甚麼在這裡。

I don't know why you're here.

Source: Tatoeba

Sentence Composition

1 我不知道 wǒbùzhīdào I don't know.
=2 你 nǐ you (informal, as opposed to courteous 您 nín)
=2 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
=3 為 wéi
  1. as (in the capacity of)
  2. to take sth as
  3. to act as
  4. to serve as
  5. to behave as
  6. to become
  7. to be
  8. to do
  9. by (in the passive voice)
=3 為 wèi
  1. because of
  2. for
  3. to
=4 甚 shén variant of 什 shén
=4 甚 shèn
  1. excessive; undue
  2. to exceed; to be more than
  3. very; extremely
  4. (dialect) what; whatever (Taiwan pr. shén)
=5 麼 má exclamatory final particle
=5 麼 ma interrogative final particle
=5 麼 me suffix, used to form interrogative 什么 shénme, what?, indefinite 这么 zhème thus, etc
=5 麼 mó
  1. tiny
  2. insignificant
6 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)
7 這裡 zhèlǐ here