我会帮你转达你的问候。

Wǒ huì bāng nǐ zhuǎndá nǐ de wènhòu.

I’ll pass along your greetings.

我向他表示诚挚的问候。

Wǒ xiàng tā biǎoshì chéngzhì de wènhòu.

I expressed sincere greetings to him.

他们互相问候并交换名片。

Tāmen hùxiāng wènhòu bìng jiāohuàn míngpiàn.

They greeted each other and exchanged business cards.