那是因為妳是女生。

That's because you're a girl.

Source: Tatoeba

Sentence Composition

=1 那是 nàshi
  1. (coll.) of course
  2. naturally
  3. indeed
=1 那是 nàshì
  1. (colloquial) of course
  2. of course
2 因為 yīnwèi
  1. because
  2. owing to
  3. on account of
=3 妳 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
=3 妳 nǎi variant of 嬭 nǎi
=4 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)
=4 是 shì variant of 是 shì
5 女生 nǚshēng
  1. schoolgirl
  2. female student
  3. girl