昨天這個時候你在做什麼？

What were you doing at this time yesterday?

Source: Tatoeba

Sentence Composition

1 昨天 zuótiān yesterday
2 這個 zhège
  1. (pronoun) this
  2. (adjective) this
3 時候 shíhou
  1. time
  2. length of time
  3. moment
  4. period
=4 你 nǐ you (informal, as opposed to courteous 您 nín)
=4 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.)
5 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)
6 做什麼 zuòshénme
  1. (dialectal) why; what for
  2. what to do
  3. why; what for