因為是星期天，超市非常擁擠。

It being Sunday, the supermarket was very crowded.

Source: Tatoeba

Sentence Composition

1 因為 yīnwèi
  1. because
  2. owing to
  3. on account of
=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 星期天 Xīngqītiān Sunday
=3 星期天 xīngqītiān Sunday
4 超市 chāoshì supermarket (abbr. for 超级市场 chāojíshìchǎng)

classifier: 家
5 非常 fēicháng
  1. very; really
  2. unusual; extraordinary
6 擁擠 yōngjǐ
  1. crowded
  2. to throng
  3. congestion