他们俩又在吵架了。

Those two are arguing again.

Those two are quarrelling again.

Those two are quarreling again.

Source: Tatoeba

Sentence Composition

1 他们俩 tāmenliǎ the two of them; those two people
2 又 yòu
  1. (once) again
  2. also
  3. both... and...
  4. and yet
  5. (used for emphasis) anyway
3 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)
4 吵架 chǎojià
  1. to quarrel
  2. to have a row
  3. quarrel

classifier: 頓
=5 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=5 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)
=5 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=5 了 liào unofficial variant of 瞭 liào