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Here we repeat the verb used and place 又 in the middle. The repetition of the verb emphasizes how the action is being repeated again and again. This one is definitely the most advanced usage of 又 here, and you're not going to use it nearly as much as the others.
=== Structure ===
In the pattern below, 又, together with a repeating verb, indicates that the speaker did something repeatedly (not just twice) in the past. Note that verb used here must be a single-syllable verb, usually like 看, 想, 问, 找, 试, etc. 了 is placed right after the first 又.
Subj. ＋Verb + 了 + 又 + Verb，还是 / 就是 ……
Note that "还是" or "就是" is often used to emphasize that "nothing changed" after all.
=== Examples ===
*这 个 人 我 看 了又 看，还是 觉得 我 不 认识 他。Zhège rén wǒ kàn le yòu kàn, háishì juéde wǒ bù rènshi tā.I looked at him again and again, but I still think I don't know him.
* 我 想 了又 想，还是 觉得 不 能 这样 做 。Wǒ xiǎng le yòu xiǎng, háishì juéde bù néng zhèyàng zuò.I thought it over again and again, I think I can't do it like this.
*他 找了又 找，还是 没 找到 他 的 钱 包。Tā zhǎo le yòu zhǎo, háishì méi zhǎodào tā de qiánbāo He searched again and again, and still couldn't find his wallet.
*他 想了又 想，还是 不 同意。Tā xiǎng le yòu xiǎng, háishì bù tóngyì.He thought it over again and again, and he still disagree.
*我们 问 了 又 问，她 就是 不 说。Wǒmen wèn le yòu wèn, tā jiùshì bù shuō.We asked again and again, but she wouldn't say it.
*他 试 了 又 试，就是 打 不 开 门。Tā shì le yòu shì, jiùshì dǎ bù kāi mén.He tried again and again, but he still couldn't open the door.
*我 尝 了 又 尝，还是 觉得 这些 菜 坏 了。Wǒ cháng le yòu cháng, háishì juéde zhèxiē cài huài le.I tasted again and again, but I still think those food has gone bad.
*他 闻 了 又 闻，还是 什么 都 没 闻到。Tā wén le yòu wén, háishì shénme dōu méi wéndào.He smelled again and again, but he still didn't smell anything.
*这 个 方案 改了又 改，终于 通过 了。Zhège fāng'àn gǎi le yòu gǎi, zhōngyú tōngguò le.This plan was changed again and again, and finally it passed.
*这 件 衣服 妈妈 洗了又 洗，终于 洗 干净 了。Zhè jiàn yīfu māma xǐ le yòu xǐ, zhōngyú xǐ gānjìng le.Mother washed this clothing again and again, and it's finally clean.
==See also==
*[[Expressing "both A and B" with "you" ]]
*[[Expressing "again" in the past with "you"]]
*[[Comparing "zai" and "you"]]
*[[Emphasizing negation with "you"]]
== Sources and further reading ==
=== Books ===
[[Category:B2 grammar points]]
{{Basic Grammar|又|B2|Subj. + Verb + 了 + 又 + Verb |他 找 了 又 找，还 是 没 找到 他 的 钱 包。|grammar point|ASGF08B6}}
{{Similar|Expressing "again" in the past with "you"}}
{{Similar|Comparing "zai" and "you"}}
{{Similar|Emphasizing negation with "you"}}
{{Rel char|又}}
{{Used for|Describing actions}}
{{POS|Adverbs}}