我不知道什么时候要在那里。

I don't know when I should be there.

I don't know when I need to be there.

Source: Tatoeba

Sentence Composition

1 我不知道 wǒbùzhīdào I don't know.
2 什么时候 shénmeshíhou when?; at what time?
=3 要 yāo (bound form) to demand; to coerce
=3 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=3 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
4 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)
=5 那里 nàli there; that place
=5 那里 nàli there; that place