There is a different between formal and informal Mandarin Chinese. For examples:
1. Hello!
a. 你好(nǐhǎo) ! informal
Example:
你好(nǐhǎo)! 好久不见(hǎojiǔbujiàn)。你(nǐ)怎么样(zěnmeyàng)?
b. 您好(nínhǎo)!formal
Example:
您好(nínhǎo)! 我(wǒ)先(xiān)介绍(jièshào)下(xià)我的(wǒde)相关(xiāngguān)信息(xìnxī)。
2. Nice to meet you
a. 很(hěn)高兴(gāoxìng)认识(rènshi)你(nǐ)。Informal
b. 幸会(xìnghuì) more formal
3. What is your surname?
a. 你(nǐ)姓(xìng)什么(shénme)?informal
b. 您(nín)贵姓(guìxìng)?formal
4. Husband
a.老公(lǎogōng) informal
Example:
我(wǒ)老公(lǎogōng)喜欢(xǐhuan)吃(chī)辛辣(xīnlà)食物(shíwù)。
b. 先生(Xiānsheng) more formal
Example:
我(wǒ)先生(xiānsheng)的(de)帐户(zhànghù)上(shàng)输入(shūrù)一定(yīdìng)数量(shùliàng)的(de) 款项(kuǎnxiàng)。
5. Wife
a.老婆(lǎopó) informal
Example
我(wǒ)老婆(lǎopó)一直(yīzhí)想(xiǎng)离婚(líhūn),但是(dànshì)我(wǒ)不(bù)同意(tóngyì)。
b.太太(tàitai) more formal
这(zhè)是(shì)您(nín)太太(tàitai)的(de)照片(zhàopiàn)吗(ma)?
6. Welcome
a. 欢迎(huānyíng) formal and informal
Example:
欢迎(huānyíng)来到(láidào)中国(Zhōngguó)。
b. 欢迎光临(huānyíngguānglín) formal
欢迎光临(huānyíngguānglín),请问(qǐngwèn)您(nín)要(yào)些(xiē)什么(shénme)?
10. Parent
a. 爸妈(bàmā) informal
Example:
我(wǒ)和(hé)爸妈(bàmā)才(cái)到(dào)爷爷(yéye)家里(jiālǐ)。
b. 父母(fùmǔ) more formal
Example:
父母(fùmǔ)和(hé)家长(jiāzhǎng)该(gāi)如何(rúhé)处理(chǔlǐ)孩子(háizi)早恋(zǎoliàn)问题(wèntí)?
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