HSK 5
A的A，B的B
A de A ， B de B
Structure "A的A，B的B"
Explanation
This is a fixed construction (格式 gùdìng géshì: a common sentence frame) 'A的A，B的B', in which A and B are usually two antonymous adjectives, used to describe things/people in a group that are uneven, each one different, usually implying disorder and lack of harmony.
adjective A + 的 + A + ，+ adjective B + 的 + B. Here 的 (de) is a particle (a function word indicating a grammatical role).
大的大，小的小 (dà de dà, xiǎo de xiǎo: the big ones are big, the small ones are small), 老的老，少的少 (the old ones are old, the young ones are young).
When listing to show that the things in a group span every extreme, are inconsistent, usually accompanied by a negative remark afterward (没有合适的 there's none suitable, 不整齐 not tidy).
Vietnamese learners often use two non-antonymous adjectives (A, B must be opposites like big/small, tall/short, old/young) or forget the 的 in the middle. Also, don't confuse this with 'A就A' (which expresses concession); this is a pattern describing chaotic diversity.
Examples
As for the clothes, the big ones are big and the small ones are small; there isn't a single one that fits.
At home, the old are old and the young are young, so we have to give her a hand.
The buildings here have some tall and some short; they don't look very orderly.
Practice
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Learn “A的A，B的B” effectively
The grammar point “A的A，B的B” (Structure "A的A，B的B") is one of the key structures at HSK 5. To use it fluently, you need to understand the contexts where it's used and practice regularly.
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