他老是开夜车。

He always sits up late at night.

He's always burning the midnight oil.

Source: Tatoeba

Sentence Composition

1 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
=2 老是 lǎoshi always
=2 老是 lǎoshì
  1. (colloquial, often derogatory) always; forever
  2. always; forever
3 开夜车 kāiyèchē
  1. to burn the midnight oil
  2. to work late into the night