是 + noun + 的
Reach for this when you want to label or classify something — 'X is the [noun] kind / X belongs to [noun].' The frame puts a descriptor noun between 是 and 的, turning the noun into a classifying adjective. 小明是三年级的学生 doesn't just say he is a student — it pins down which grade. Use it any time you want to say someone or something is a specific type, member, or version.
Structure
[SUBJECT] 是 [NOUN/PHRASE] 的 [HEAD NOUN]
shì... de...
How to Think About It
The 的 turns whatever noun you put before it into a modifier. 三年级 is 'third grade'; 三年级的学生 is 'a third-grade student.' Without 的, the two nouns just sit next to each other and the listener doesn't know whether you mean 'third grade' or 'third-grade student.' 的 is the glue that makes the first noun describe the second.
Examples
小明是三年级的学生。
Xiǎo Míng shì sān niánjí de xuéshēng.
Xiao Ming is a third-grade student.
这是我哥哥的书。
Zhè shì wǒ gēge de shū.
This is my older brother's book.
她是法国的老师。
Tā shì Fǎguó de lǎoshī.
She is a French teacher (a teacher from France).
Common Mistake
Learners drop 的 because in English you say 'a third-grade student' with nothing between the words. In Chinese, when one noun modifies another and the modifier is longer than one syllable, 的 is required — without it the sentence sounds incomplete.
小明是三年级学生。
小明是三年级的学生。
Don't Confuse With
是...的 (emphasis)
The other 是...的 construction emphasizes WHEN, WHERE, or HOW something happened: 我是昨天来的 ('I came yesterday'). That version has no noun between — it wraps the verb phrase.
Noun + Noun (no 的)
Some short fixed compounds skip 的: 中国学生, 男孩子. Use the bare form only for tight common pairings; once the modifier is descriptive or longer, put 的 back.
有 + Noun
有 says something EXISTS or possesses; 是...的 says what KIND it is. 我有妹妹 = 'I have a sister.' 她是我的妹妹 = 'She is my sister.'
Practice
小明 ___ 三年级的学生。
Show answer
是
这是我妈妈 ___ 手机。
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的
Arrange: [是 / 的 / 我 / 学生 / 大学]
Show answer
我是大学的学生。
Translate to Chinese: 'He is a Chinese teacher.'
Show answer
他是中文的老师。
Write one sentence using 是 + [noun] + 的 + [noun] to describe yourself.
Show answer
Example answer: 我是北京的工程师。 (I am an engineer from Beijing.)
Hear It in Real Episodes
This pattern appears in 1 Fluentide episode:
Related Grammar Patterns
Acquire by listening
Hear 是 + noun + 的 in real Chinese, not in a textbook.
Fluentide picks the next news episode at your level, so this pattern shows up again and again in real context. The transcript marks it, the audio drills it. Free to start, no card.