牛奶變酸了。

The milk turned sour.

Source: Tatoeba

Sentence Composition

1 牛奶 niúnǎi cow's milk

classifiers: 瓶, 杯
2 變 biàn
  1. to change
  2. to become different
  3. to transform
  4. to vary
  5. rebellion
3 酸 suān
  1. sour
  2. tart
  3. sick at heart
  4. grieved
  5. sore
  6. aching
  7. pedantic
  8. impractical
  9. to make sarcastic remarks about sb
  10. an acid
=4 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=4 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 無 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 瞭 liǎo)
=4 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=4 了 liào unofficial variant of 瞭 liào