4 sentences

1. 公交车上应当给孕妇让座。

   gōng​jiāo​chē shàng yīng​dāng gěi yùn​fù ràng​zuò.

   One should give up their seat to pregnant women on the bus.

   Source: Dong Chinese Dictionary

2. 小朋友，快给这位公公让座。

   xiǎo​péng​yǒu, kuài gěi zhè wèi gōng​gong ràng​zuò.

   Child, please give up your seat for this elderly gentleman.

   Source: Dong Chinese Dictionary

3. 乘车时请主动给老人让座。

   chéng​chē shí qǐng zhǔ​dòng gěi lǎo​rén ràng​zuò.

   Please take the initiative to give up your seat to the elderly when riding the bus.

   Source: Dong Chinese Dictionary

4. 公共汽车上应该给老人让座。

   gōng​gòng qì​chē shàng yīng​gāi gěi lǎo​rén ràng​zuò.

   One should give up their seat to the elderly on the bus.

   Source: Dong Chinese Dictionary