X 就是 Y
Reach for this when you want to define a term inline — 'X is just Y, plain and simple.' 邮轮就是很大很大的船. (A cruise ship is just a very big ship.) Use it to gloss a word the listener might not know, paraphrase a concept in simpler language, or restate something for emphasis. Teachers, journalists, and parents lean on this pattern constantly when introducing new vocabulary.
Structure
[TERM] 就是 [SIMPLER EXPLANATION]
[TERM] jiùshì [EXPLANATION]
How to Think About It
就是 is an equals sign with attitude. Bare 是 just says 'A is B' neutrally. 就是 adds 'precisely, nothing more.' That's why it's the teaching pattern: it closes the door on any complication and says 'this term equals this simpler thing, end of story.' Once you hear 就是 in conversation, expect a definition or a flat clarification to follow.
Examples
邮轮就是很大很大的船。
Yóulún jiùshì hěn dà hěn dà de chuán.
A cruise ship is just a very big boat.
搞笑就是让人笑。
Gǎoxiào jiùshì ràng rén xiào.
'搞笑' just means making people laugh.
病毒就是看不见的小东西。
Bìngdú jiùshì kàn bú jiàn de xiǎo dōngxi.
A virus is just a tiny thing you can't see.
我想要的就是这本书。
Wǒ xiǎng yào de jiùshì zhè běn shū.
This is exactly the book I want.
问题就是钱不够。
Wèntí jiùshì qián bú gòu.
The problem is simply that there isn't enough money.
他就是我说的那个人。
Tā jiùshì wǒ shuō de nàge rén.
He's exactly the person I was talking about.
工厂就是做东西的地方。
Gōngchǎng jiùshì zuò dōngxi de dìfang.
A factory is basically a place where things are made.
幸福就是和家人在一起。
Xìngfú jiùshì hé jiārén zài yìqǐ.
Happiness is just being with your family.
Common Mistake
Learners use 就是 to mean 'it is also' or 'it's exactly that.' But the defining 就是 only works when X is a TERM/CONCEPT being equated with a Y EXPLANATION. Using it as an emphatic 'yes' tag is a different (correct) use — but using it where you mean 'and also' is wrong.
我喜欢咖啡, 就是茶。
我喜欢咖啡, 也喜欢茶。
Don't Confuse With
X 是 Y
是 alone identifies or describes ('He is a doctor'). 就是 emphasizes equivalence and is used to DEFINE or paraphrase ('A doctor is just someone who treats sick people'). If you're not glossing a term, plain 是 is enough.
也就是说
也就是说 ('that is to say') restates a whole sentence in formal/expository register. X 就是 Y defines a single term inline. Use 就是 inside a sentence; 也就是说 to start a new clarifying sentence.
意思是
意思是 = 'the meaning is...' — more explicit, used when you're translating or interpreting. '"染上"的意思是"开始喜欢"' feels textbook-like; '"染上"就是"开始喜欢"' feels conversational. Same job, different register.
X 就是 Y (defining)
When 就是 sits BETWEEN two phrases ('term 就是 explanation'), it's the inline-definition pattern. When it sits at the START of a phrase ('就是这个'), it emphasizes that this is the precise/only answer. Same word, two flavors.
正是 / 恰恰是
正是/恰恰是 carry the same 'exactly this' meaning but in a formal/written register. '这正是问题所在' (This is exactly the problem) is essay-style; '就是这个问题' is conversational.
Practice
公司 ___ 很多人一起工作的地方。
Show answer
就是
电的车 ___ 不用油的车。
Show answer
就是
Put in order: [就是 / 很冷 / 地球 / 的 / 南极 / 最 / 地方]
Show answer
南极就是地球最冷的地方。
Translate to Chinese: 'A doctor is just someone who treats sick people.'
Show answer
医生就是给病人看病的人。
Define a Chinese word you learned recently using X 就是 Y.
Show answer
Example answer: 'AI' 就是人工智能, 让电脑像人一样思考。 (AI is artificial intelligence — making computers think like people.)
Hear It in Real Episodes
This pattern appears in 20 Fluentide episodes:
Related Grammar Patterns
Acquire by listening
Hear X 就是 Y 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.