EXPLAIN OF 就是
1. When using 就是 with 了at the end of a sentence it's used for emphasize sentence.
放心吧, 我照办就是了。
Fàngxīn ba, wǒ zhàobàn jiùshì le.
Don’t worry. I’ll do just as you say.
他不过想要点儿钱就是了。
tā buguò xiǎngyào diǎnr qián jiùshì le.
All that he wants is some money.
2. It's used for "yes"
这是不是你说的那个？——就是。
Zhè shì bù shì nǐ shuō de nàge？ - jiù shì.
Is that what you were talking about? — Yes, that’s it.
就是嘛, 我也是这么想的。
Jiù shì ma, wǒ yě shì zhème xiǎng de.
Precisely, that’s just what I think too.
3. It's used for exactly; precisely
那个 人 就是 她 的 新 男朋友。
Nàge rén jiùshì tā de xīn nánpéngyou.
That guy is her new boyfriend.
他 就是 那个 骗子！
Tā jiùshì nàge piànzi!
he is that cheater !
4. 就是 also used as "even if"
你就是不告诉我，我也知道是怎么回事.
nǐ jiù shì bú gào su wǒ, wó yě zhī dào shì zěn me huí shì .
phr. Even if you don't tell me, I know what it is.
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