Korean grammar
So I self learnt my korean, very informally.
One thing I find difficult is the grammar.
Ie. Lets use the word '가' (go)
1. 우리 가자 - Let's go
2. 우리 갔어 - We went(?)
3. 우리 간다 - we have gone(?)
4. 우리 가요 - formal speaking of lets go because of the 'yo'?
Is that correct?

