你昨天為甚麼在家？

Why did you stay at home yesterday?

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 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.)
2 昨天 zuótiān yesterday
=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 在家 zàijiā
  1. to be at home
  2. (at a workplace) to be in (as opposed to being away on official business 出差 chūchāi)
  3. (Buddhism etc) to remain a layman (as opposed to becoming a monk or a nun 出家 chūjiā)