是 shì is a predicate verb that expresses a confirming and positive judgment when used as the subject of a sentence. One of the most typical Chinese sentence structures is “subject + (the predicate verb) + object.”
是 shì can have similar meanings as “to be”, “is”, “yes” etc. in English.
For examples:
Wǒ shì Nuówēi rén.
我是挪威人。
I am Norwegian.
Tā shì jīnglǐ.
他是经理。
He is the manager.
Wǒ shì lǎoshī.
我是老师。
I’m a teacher.
Tā shì Huò Kūn.
他是霍坤。
He is Haakon.
Nǐmen shì xuéshēng.
你们是学生。
You are students.
Putting the negative verb “不 bù” before “是 shì” creates the negative form of 是 shì.
When preceding a fourth tone the character “不” bù is pronounced as a second tone bú.
So the correct way to negate 是 shì is to say búshì
For examples:
Wǒ búshì nuówēi rén.
我不是挪威人。
I am not Norwegian.
Tā búshì jīnglǐ.
他不是经理。
He is not the manager.
Wǒ búshì lǎoshī.
我不是老师。
I’m not a teacher.
Tā búshì Huò Kūn.
他不是霍坤。
He is not Haakon.
Nǐmen búshì xuéshēng.
你们不是学生。
You are not students.
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