What do you mean by he ni in mandarin?

"He ni" (你) in Mandarin Chinese means "you". It is a very common and versatile pronoun used to address someone directly.

Here are some examples:

* 你好 (nǐ hǎo): Hello, you

* 你叫什么名字？ (nǐ jiào shénme míngzi?): What is your name?

* 你今天怎么样？ (nǐ jīntiān zěnmeyàng?): How are you today?

* 你去哪里？ (nǐ qù nǎlǐ?): Where are you going?

Note: "He ni" can be used in both formal and informal situations. However, there are other ways to say "you" in Mandarin that are more formal or polite.

For example, "您 (nín)" is a more respectful way to say "you" and is often used when addressing someone older or in a position of authority.