X了Y，Y了X for “Over and Over Again”
Use 吃了睡，睡了吃 and 写了擦，擦了写 to describe two actions going round in a circle again and again.
문형
动词X + 了 + 动词Y，动词Y + 了 + 动词X
Swap two verbs around 了 to show the same two actions repeating in a loop, often with a sense of “again and again, with no end.”
放假在家，他每天吃了睡，睡了吃。
When to use X了Y，Y了X for “Over and Over Again”
Take two single verbs, X and Y. First say X了Y, “after X, Y,” then swap them: Y了X, “after Y, X.” Together, 吃了睡，睡了吃 means “eat, then sleep, then eat, then sleep…”: the two actions keep coming back in a circle.
这个字太难写了，我写了擦，擦了写，还是写不好。
This character is so hard. I wrote it, rubbed it out, wrote it again, and still couldn’t get it right.
这篇作文我改了写，写了改，一共写了五遍。
I revised and rewrote this essay again and again: five drafts in total.
妹妹在商店里试衣服，穿了脱，脱了穿，半天也决定不了。
My sister was trying on clothes in the shop, putting them on and taking them off, and couldn’t decide for ages.
这个玩具他拆了装，装了拆，玩了一个下午。
He took the toy apart and put it back together over and over, playing with it all afternoon.
흔한 실수
- Swap the verbs in the second half: 吃了睡，睡了吃, not 吃了睡，吃了睡.
- Use two different verbs; for one repeated action, use V了又V instead.
- Keep 了 in both halves; 着 or 过 cannot replace it here.
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