昨天是星期五，後天是星期一。

Yesterday was Friday; the day after tomorrow is Monday.

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 後天 hòutiān
  1. the day after tomorrow
  2. life after birth (the period in which one develops through experiences, contrasted with 先天 xiāntiān)
  3. acquired (not innate or congenital)
  4. a posteriori
=5 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)
=5 是 shì variant of 是 shì
=6 星期一 Xīngqīyī Monday
=6 星期一 xīngqīyī Monday