当时我不在办公室，我不知道发生了什么事。

I wasn't in the office then. I don't know what happened.

Source: Tatoeba

Sentence Composition

=1 当时 dāngshí
  1. then
  2. at that time
  3. while
=1 当时 dàngshí
  1. at once
  2. right away
2 我 wǒ
  1. I
  2. me
  3. my
3 不在 bùzài
  1. not to be present
  2. to be out
  3. (euphemism) to pass away
  4. to be deceased
4 办公室 bàngōngshì office; business premises
5 我不知道 wǒbùzhīdào I don't know.
6 发生 fāshēng to happen; to occur; to take place; to break out
=7 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=7 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 无 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 了 liǎo)
=7 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=7 了 liào unofficial variant of 瞭 liào
8 什么事 shénmeshì
  1. What's up?; Is something the matter?
  2. (coll.) (used in rhetorical questions of the form 关 guān + {person} + 什么事 shénmeshì "what business is it of {person}'s?; what's it to {person}?")