这不是真的。

This is not true.

Source: Tatoeba

Sentence Composition

=1 这不 zhèbu (coll.) As a matter of fact, ... (used to introduce evidence for what one has just asserted)
=1 这不 zhèbù connects two clauses, emphasising how the following clause substantiates the preceding clause
=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 真的 zhēnde
  1. really; truly; indeed
  2. real; true; genuine
  3. (math.) proper
=3 真的 zhēndí
  1. (literary) true; real
  2. true; real