昨天是星期五，所以他休息了一天。

Yesterday was Friday, so he took a break.

Source: Tatoeba

Sentence Composition

1 昨天 zuótiān yesterday
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì
=3 星期五 Xīngqīwǔ Friday
=3 星期五 xīngqīwǔ Friday
4 所以 suǒyǐ
  1. therefore
  2. as a result
  3. so
  4. the reason why
5 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)
6 休息 xiūxi
  1. rest
  2. to rest
=7 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=7 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)
=7 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=7 了 liào unofficial variant of 瞭 liào
8 一天 yītiān
  1. (colloquial) the whole day
  2. one day (twenty-four hours)
  3. someday; one day
  4. the entire daytime of one day
  5. the whole day