1. 请代我向你们全家致以最诚挚的问候。

[ qǐng dài wǒ xiàng nǐ mén quán jiā zhì yǐ zuì chéng zhì de wèn hòu 。 ]

Please give my best regards to your family.

2. 字母x代表未知数。

[ zì mǔ x dài biǎo wèi zhī shǔ 。 ]

The letter "x" stands for an unknown number.

3. 甲壳虫乐队代表了他们时代的部分精神。

[ jiǎ qiào chóng yuè duì dài biǎo le tā mén shí dài de bù fēn jīng shén 。 ]

The Beatles represented part of the spirit of their age.

4. 我代表我们公司欢迎你来这里。

[ wǒ dài biǎo wǒ mén gōng sī huān yíng nǐ lái zhè lǐ 。 ]

On behalf of my company, I would like to welcome you here.

5. 请代我向你母亲问好。

[ qǐng dài wǒ xiàng nǐ mǔ qīn wèn hǎo 。 ]

Please say hello to your mother for me.