"This is that bus."
Translation:Ez az a busz.
The English sentence would be 'This is the bus'. I understand it's deliberately suggesting the expected Hungarian translation, but it's just off.
Yes. When saying "This/That/These/Those", you say "Ez/Az/Ezek/Azok" + Definite Article.
- This man = Ez a férfi
- Those people = Azok az emberek
When using a demonstrative adjective you also need the definite article. See adamyoung97's comment.