4 sentences

1. 她不赞成婚前性行为。

   tā bù zàn​chéng hūn​qián xìng​xíng​wéi.

   She doesn't believe in sex before marriage.

   Source: OpenSubtitles

2. 他摇了摇头，表示不赞成。

   tā yáo le yáo​tóu, biǎo​shì bù zàn​chéng.

   He shook his head in disapproval.

   Source: Dong Chinese Dictionary

3. 一句话，我不赞成这个计划。

   yī​jù​huà, wǒ bù zàn​chéng zhè​ge jì​huà.

   In short, I don't approve of this plan.

   Source: Dong Chinese Dictionary

4. 让我来告诉你我不赞成你的理由。

   ràng wǒ lái gào​su nǐ wǒ bù zàn​chéng nǐ de lǐ​yóu.

   Let me tell you the reasons that I don't agree with you.

   Source: Tatoeba