ni hao, Shane, huan ying ni lai Bennysland. Let me explain to you how to use “jiu”
1. “jiu” is used to indicate short time, it is used for future and past tense, for example:
nǐ shén me shí hòu lái? = when will you come?
wǒ jiù lái = I’m coming soon
2. “jiu” could be used as “only” for example:
Who ate the bread? Is that you, Benny? (With angry tone)
bù, bú shì wǒ . wǒ jiù chī le 2 piàn miàn bāo = no, it wasn’t me, I only had 2 pieces of bread
Besides this, “jiu” can also be used to emphasize the object, for example:
nǐ hǎo, wǒ zhǎo Benny = hello, I’m looking for Benny
wǒ jiù shì = I am