出 /chū/ describes the movement FROM INSIDE TOWARDS OUTSIDE
出去 /chūqù/ is TO GO OUT
出来 /chūlái/ is TO COME OUT
Let's go out!
我们 出去 了 吧!
Wǒmen chūqù le ba!
Come out!
你 出来 吧!
Nǐ chūlái ba!
I want to go out with you.
我 想 跟 你 出去。
Wǒ xiǎng gēn nǐ chūqù.
At what time do we depart?
The air isn’t good today. You better not go.
今天 空气 不 好。你 还是 别 出去。
Jīntiān kōngqì bù hǎo. Nǐ háishì bié chūqù.
The weather is very good. Let’s go out!