Ok then I would offer you some examples I can think of,
1) 就=just / only
你就知道吃。 You just / only care about eating.
2) 如果..(condition)........, subject 就verb +object = if ......... , ...........
如果............, ...就.................... (collocation) ,sometimes, people always omit 如果 when they are talking, but the logic doesn't change.
(如果)你去,我就等你一块儿去。
3)就是 = just / exactly be
---- 到底哪个是你的? which on earth is yours ?
----这个就是/ 就是这个。 this is exactly mine.
4) 就= 无论如何 no matter how..... / anyhow
我就弄不懂了,你究竟是怎么想的 ?I can't see anyhow , .........