The A了又B，B了又A structure
The A了又B，B了又A 
structure emphasizes that two actions are repeated one after another and that these actions take a long time. For example, "he opened and closed it, then opened and closed it again".
One-syllable verbs usually replace “A” and “B”.
structure emphasizes that two actions are repeated one after another and that these actions take a long time. For example, "he opened and closed it, then opened and closed it again".
One-syllable verbs usually replace “A” and “B”. Pay attention
This structure is used in colloquial speech.
Scheme
action 1
了又
action 2
action 2
了又
action 1
Examples
他装了又拆，拆了又装，修理了一整天
He set it up and disassembled it over and over. He was fixing it all day
tā zhuāng le yòu chāi, chāi le yòu zhuāng, xiūlǐ le yì zhěng tiān
小朋友写了又擦，擦了又写，正在认真地练习写汉字
Children are writing characters, then and erasing them, then writing and erasing them again, . They are faithfully practicing writing Chinese characters
xiǎo péngyou xiě le yòu cā, cā le yòu xiě, zhèngzài rènzhēn de liànxí xiě hànzì
In this structure, actions can happen one by one:
Scheme
action 1
了又
action 1
action 2
了又
action 2
Examples
她把布摸了又摸，看了又看，说这布不错
She touched the fabric, looked at it for a long time, and after that said the fabric was good
tā bǎ bù mō le yòu mō, kàn le yòu kàn, shuō zhè bù búcuò
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