我們不知道他們會乘哪一班列車。

We didn't know what train they'd be on.

Source: Tatoeba

Sentence Composition

1 我們 men we; us; ourselves; our
2 不知 zhī
  1. not to know
  2. unaware
  3. unknowingly
  4. fig. not to admit (defeat, hardships, tiredness etc)
=3 dào
  1. (bound form) way; reason; principle
  2. (bound form) a skill; an art; a specialization
  3. (Daoism) the Way; the Dao
  4. to say (introducing a direct quotation, as in a novel)
  5. (bound form) to express; to extend (polite words)
  6. classifier for long thin things (rivers, cracks, shadows etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process
  7. (old) circuit (administrative division)

classifiers: ,

=3 dǎo
  1. (obsolete on its own in Standard Chinese) alternative form of / (dǎo, “to direct; to guide; to lead; to conduct”)
  2. alternative form of / (dǎo, “to direct; to guide; to lead; to conduct”)
4 他們 men they; them
=5 huì
  1. can; to have the skill; to know how to
  2. to be likely to; to be sure to
  3. to meet; to get together
  4. meeting; gathering
  5. (suffix) union; group; association
  6. (bound form) a moment (Taiwan pr. huǐ)
=5 kuài (bound form) to reckon accounts
=5 kuò only used in 會撮会撮
=6 Chéng surname Cheng
=6 chéng
  1. to ride
  2. to mount
  3. to make use of
  4. to avail oneself of
  5. to take advantage of
  6. to multiply (math.)
  7. Buddhist sect or creed
=6 shèng
  1. (archaic) four horse military chariot
  2. (archaic) four
  3. generic term for history books
=6 chéng old variant of chéng
=7
  1. how
  2. which
=7 na (emphatic sentence-final particle, used instead of a after a word ending in "n")
=7
  1. used in 哪吒 zhā
  2. Taiwan pr. nuó
=7 něi which? (interrogative, followed by classifier or numeral-classifier)
8
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
=9 Bān surname Ban
=9 bān
  1. team; class; grade
  2. (military) squad
  3. work shift
  4. classifier for groups of people and scheduled transport vehicles

classifier:

10 列車 lièchē (railway) train