別忘了寄信。

Don't forget to post the letter.

Source: Tatoeba

Sentence Composition

=1 別 Bié surname Bie
=1 別 bié
  1. to leave; to part (from)
  2. (literary) to differentiate; to distinguish
  3. (dialect) to turn away; to turn aside; to avert (one's face, gaze etc)
  4. (bound form) other; another; different
  5. don't ...!
  6. to fasten with a pin or clip
  7. to stick in; to insert (in order to hinder movement)
  8. (noun suffix) category (as in 性别 xìngbié, 派别 pàibié)
2 忘 wàng
  1. to forget
  2. to overlook
  3. to neglect
=3 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=3 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)
=3 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=3 了 liào unofficial variant of 瞭 liào
4 寄信 jìxìn to post a letter; to mail