在
zài
I v.
1) be at/in/on
请问，老王在吗？ Excuse me, is Old Wang there/here?
2) exist; live
我爸爸已经不在了。 My father has passed away.
3) depend on; rest with
II adv.
indicating an action in progress
昨天四点我在游泳。 I was swimming at four yesterday.
III cov.
in; at; on; etc.
我在北京住。 I live in Beijing.
IV cons.
1) 在 A (zhī)zhōng: in (the midst/process of) A
2) 在 A kàn(lai): as A sees it; in A's opinion
在我看来 as I see it.