HSK 3 grammar · pattern
量词重叠
量词重叠 — reduplicated measure (every / each)
Pattern
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天天, 年年
( ) can be left out · other words may come before, between and after
How it works
Repeating a measure word (个个, 条条) or a time noun (天天, 年年) means "every one" / "each". It often pairs with 都 to stress that this holds for all of them.
Examples
这些苹果个个都很甜。
Zhèxiē píngguǒ gègè dōu hěn tián.
Every one of these apples is sweet.
他天天都去跑步。
Tā tiāntiān dōu qù pǎobù.
He goes running every day.
我们班的学生人人都很努力。
Wǒmen bān de xuésheng rénrén dōu hěn nǔlì.
Every student in our class works hard.
Related

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