3 sentences

1. 我是那种很讲理的新加坡人。

   wǒ shì nà zhǒng hěn jiǎng​lǐ de Xīn​jiā​pō​rén.

   I'm a reasonable type of Singaporean.

   Source: OpenSubtitles

2. 他向来是个讲理的人，不会无缘无故发火。

   tā xiàng​lái shì gè jiǎng​lǐ de rén, bù huì wú​yuán​wú​gù fā​huǒ.

   He has always been a reasonable person and doesn't get angry for no reason.

   Source: Dong Chinese Dictionary

3. 跟他这种蛮横的人根本没法讲理。

   gēn tā zhè zhǒng mán​hèng de rén gēn​běn méi​fǎ jiǎng​lǐ.

   It is impossible to reason with someone as unreasonable as him.

   Source: Dong Chinese Dictionary