The word 是 (shì) in modern standard Chinese is often translated as “to be,” but this can be confusing because it is not used in as many ways as the English verb “to be.” In Chinese, 是 is mainly used to connect two nouns or noun phrases.
It shows that one thing is the same as, or belongs to, another thing.
For example, in 我是学生 (wǒ shì xuéshēng), it means “I am a student.” Here, 是 connects “I” with “student” and shows that I belong to that group. In 那是我的书 (nà shì wǒ de shū), meaning “That is my book,” 是 links “that” with “my book” to show they are the same thing.
However, 是 is not used for location or existence. In English, we say “I am in Beijing,” but in Chinese we say 我在北京 (wǒ zài Běijīng). The word 在 (zài) is used for location, not 是, so saying 我是北京 would be incorrect.
Another important point is that 是 never changes its form. It stays the same no matter who the subject is or when the action happens. For example, 我是学生 means “I am a student,” 你是学生 means “you are a student,” and 他们是学生 means “they are students.” The verb 是 does not change like “am,” “is,” or “are” in English.
To talk about the past, Chinese does not change 是. Instead, it uses time words. For example, 我以前是学生 (wǒ yǐqián shì xuéshēng) means “I was a student before.” The word 以前 (yǐqián) shows that it is in the past.
To make a sentence negative, we put 不 (bù) before 是, forming 不是 (bú shì). For example, 我不是老师 (wǒ bú shì lǎoshī) means “I am not a teacher.” This follows a common rule in Chinese where 不 is used to negate this kind of verb.
The basic sentence pattern with 是 is simple: subject + 是 + noun. Sometimes, the subject can be left out if it is already clear. For example, if someone asks 你是老师吗 (nǐ shì lǎoshī ma), meaning “Are you a teacher?”, you can simply reply 是 (shì), meaning “yes,” or “I am.”
是 can also be used for emphasis. For example, 我是昨天来的 (wǒ shì zuótiān lái de) means “It was yesterday that I came.” In this sentence, 是 helps highlight the time “yesterday.”
It is also important to know when not to use 是, because learners often use it too much by copying English. In English, we say “The apple is red,” but in Chinese we simply say 苹果红 (píngguǒ hóng). There is no 是 because adjectives in Chinese can act like verbs. Adding 是 here would be wrong.
In the same way, 是 is not used for actions in progress. In English, we say “He is eating,” but in Chinese we say 他在吃饭 (tā zài chīfàn), using 在 instead.
By understanding how 是 is really used, it becomes easier to avoid mistakes. It is not a general translation of “to be,” but a special verb used mainly to connect nouns, show identity, and add emphasis in certain situations.
Follow me in my social medias
Facebook: https://www.facebook.com/chongshipei
Twitter: https://x.com/CShipei
Instagram: https://www.instagram.com/chongjasmine83/
Discuss: https://howtostudychinese.xyz/forum/topic/%E6%98%AF-shi/