Meaning of jiù shì:
jiù shì
就是
Adverb
exactly; precisely; only; simply; just
Zhè jiùshì wǒ xiǎng shuō de huà.
这就是我想说的话。
This is exactly what I wanted to say.
Zhè jiù shì wǒ yào shuō de.
这就是我要说的。
This is exactly what I wanted to say.
Conjunction
(used correlatively with 也[ye3]) even; even if
Jiùshì xiàyǔ, wǒ yě yào qù shàngbān.
就是下雨,我也要去上班。
Even if it rains, I will still go to work.