3 sentences for 信服 (xìn​fú — be convinced)

1. 他的理由非常充分，令人信服。

   tā de lǐ​yóu fēi​cháng chōng​fèn, lìng rén xìn​fú.

   His reasons were very sufficient and convincing.

   Source: Dong Chinese Dictionary

2. 他的推论逻辑非常严密，令人信服。

   tā de tuī​lùn luó​ji fēi​cháng yán​mì, lìng rén xìn​fú.

   His reasoning is very logical and convincing.

   Source: Dong Chinese Dictionary

3. 他的理由听起来有些牵强，很难让人信服。

   tā de lǐ​yóu tīng qi​lai yǒu​xiē qiān​qiǎng, hěn nán ràng rén xìn​fú.

   His reasoning sounds a bit far-fetched and is hard to believe.

   Source: Dong Chinese Dictionary