这些是男孩，那些是女孩。

These are boys and those are girls.

Source: Tatoeba

Sentence Composition

1 这些 zhèxiē these
=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 男孩 nánhái boy

classifier: 個
4 那些 nàxiē those
=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 女孩 nǚhái girl; lass