Question

2 prop. cu just
--||--  cu already si yet
--||-- cu since si for
 ;)

Answer 1

I just had breakfast.
Don't just stand there, come and help me.

I haven't done my homework yet. 
I already washed the dishes. 

I have been living in this town since I was born. 
I have been going to this school for 3 years now.