當您打電話來的時候我已經把信寄給您了。

I had already sent you the letter when you called.

I'd already sent you the letter when you called.

Source: Tatoeba

Sentence Composition

=1 dāng
  1. to be
  2. to act as
  3. manage
  4. withstand
  5. when
  6. during
  7. ought
  8. should
  9. match equally
  10. equal
  11. same
  12. obstruct
  13. just at (a time or place)
  14. on the spot
  15. right
  16. just at
=1 dàng
  1. at or in the very same...
  2. suitable
  3. adequate
  4. fitting
  5. proper
  6. to replace
  7. to regard as
  8. to think
  9. to pawn
  10. (coll.) to fail (a student)
2 nín you (courteous, as opposed to informal )
3 打電話 diànhuà to make a telephone call
4 來的 láide
  1. (regional, chiefly Cantonese-influenced Mandarin, colloquial) synonym of 來著 /来着 (láizhe)
  2. at; in
  3. synonym of 來著 /来着 (láizhe)
  4. to be at; to be in; to exist
  5. used to indicate the continuous aspect
5 時候 shíhou
  1. time
  2. length of time
  3. moment
  4. period
6
  1. I
  2. me
  3. my
7 已經 jīng already
=8
  1. to hold; to grasp
  2. to hold a baby in position to help it urinate or defecate
  3. handlebar
  4. classifier: handful, bundle, bunch
  5. classifier for things with handles
  6. (used to put the object before the verb: + {noun} + {verb})
=8 handle
=8
  1. (obsolete on its own in Standard Chinese) alternative form of (pá, “to scratch”)
  2. a surname
  3. alternative form of (pá, “to scratch”)
9 xìn
  1. letter
  2. mail
  3. to trust
  4. to believe
  5. to profess faith in
  6. truthful
  7. confidence
  8. trust
  9. at will
  10. at random

classifier:

10
  1. to entrust; to place in sb's care
  2. (bound form) to depend on; to attach oneself to; to reside temporarily
  3. (bound form) foster (as in 寄女 nu: foster daughter)
  4. to send by post; to mail
=11 gěi
  1. to
  2. for
  3. for the benefit of
  4. to give
  5. to allow
  6. to do sth (for sb)
  7. (grammatical equivalent of )
  8. (grammatical equivalent of )
  9. (sentence intensifier)
=11
  1. to supply
  2. to provide
12 nín you (courteous, as opposed to informal )
=13 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=13 liǎo
  1. to finish
  2. (used with or after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as or ) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of liǎo)
=13 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=13 liào unofficial variant of liào