HSK 3 grammar · pattern
疑问语调
疑问语调 — questions by rising intonation
Pattern
said with a rising tone, without 吗
( ) can be left out · other words may come before, between and after
How it works
A plain statement can become a question just by saying it with a rising tone — no 吗 needed. It often checks something or shows surprise at what was just heard. In writing, only the question mark shows it.
Examples
你不去?
Nǐ bú qù?
You're not going?
这是真的?
Zhè shì zhēn de?
This is true?
他已经走了?
Tā yǐjīng zǒu le?
He's already left?
Related

See it in a story
In the app, 疑问语调 is underlined wherever it appears in the stories you read, and practised with sentences from them. Free.