2 sentences

1. 他经常讽刺那些不守信用的人。

   tā jīng​cháng fěng​cì nà​xiē bù shǒu xìn​yòng de rén.

   He often ridicules those who do not keep their word.

   Source: Dong Chinese Dictionary

2. 你如果认为每个人都会守信用，那就太天真了。

   nǐ rú​guǒ rèn​wéi měi gè rén dōu huì shǒu xìn​yòng, nà jiù tài tiān​zhēn le.

   If you think everyone will keep their word, you're being too naive.

   Source: Dong Chinese Dictionary