The structure A就A，B就B
The structure A就A，B就B 
is used to make sentences like "If you decided to leave, then leave; if you decided to stay, then stay".
We can use this structure to emphasize that there are two options:
1) you need to perform either action "A" or action "B";
2) either one thing or another will happen.
In the above structure, "A" and "B" are replaced by either verbs or verb phrases.
is used to make sentences like "If you decided to leave, then leave; if you decided to stay, then stay".
We can use this structure to emphasize that there are two options:
1) you need to perform either action "A" or action "B";
2) either one thing or another will happen.
In the above structure, "A" and "B" are replaced by either verbs or verb phrases. Pay attention
A verb phrase is a combination of a verb and an auxiliary word. The auxiliary word can be either an auxiliary verb or an object.
Scheme
verb/verb phrase 1
就
verb/verb phrase 1
verb/verb phrase 2
就
verb/verb phrase 2
Examples
终于租了房子，以后房价涨就涨，跌就跌，已经无所谓
It doesn't matter if apartment prices fall or rise. I've already rented an apartment
zhōngyú zū le fángzi, yǐhòu fángjià zhǎng jiù zhǎng, diē jiù diē, yǐjīng wúsuǒwèi
这个东西你卖就卖，留就留，自己决定吧
You can sell this thing or keep it. It's up to you to decide what to do with it
zhè ge dōngxi nǐ mài jiù mài, liú jiù liú, zìjǐ juédìng ba
只要她提出来，看电影就看电影，买衣服就买衣服，都可以
If she wants to watch a movie, we'll watch a movie, if she wants to go shopping, we'll go shopping. She just needs to choose
zhǐyào tā tí chūlái, kàn diànyǐng jiù kàn diànyǐng, mǎi yīfu jiù mǎi yīfu, dōu kěyǐ
We can also use the structure A就A，不A就不A to form the following sentences:
"If you want to eat it, then eat; if you don't want to eat it, then don't eat".
"If you can take it, then take it; if you can't take it, then don't take it".
We can use this structure to emphasize that there are two options: to do something or to not do it. In most cases, the speaker doesn't care what the result will be.
to form the following sentences:
"If you want to eat it, then eat; if you don't want to eat it, then don't eat".
"If you can take it, then take it; if you can't take it, then don't take it".
We can use this structure to emphasize that there are two options: to do something or to not do it. In most cases, the speaker doesn't care what the result will be.Scheme
verb
(object)
就
verb
不
verb
就不
verb
In this structure, "A" is replaced with identical verbs.
If a verb is followed by an object, it is usually placed after the first verb.
Examples
我给你五十块，你卖就卖，不卖就不卖
I'll give you fifty yuan. It is up to you to decide whether to sell it or not
wǒ gěi nǐ wǔshí kuài, nǐ mài jiù mài, bú mài jiù bú mài
买就买，不买就不买，快一点决定吧
If you want to buy it, then buy it; if you don't want to buy it, then don't buy it. Hurry up!
mǎi jiù mǎi, bù mǎi jiù bù mǎi, kuài yìdiǎn juédìng ba
我很享受这种想去上课就去、想不去就不去的自由
I really like my freedom. I don't have to go to class if I don't want to
wǒ hěn xiǎngshòu zhè zhǒng xiǎng qù shàngkè jiù qù, xiǎng bú qù jiù bú qù de zìyóu