We know that kaun and jo as related like this:
kaun = who (as a question)
jo = who (as an answer)
Ye kaun hai = Who is this?
Ye Radha hai jo meri behen hai = This is Radha who is my sister
Who is that? =
That is Amit who is my friend =
Let’s look at 3 more j forms starting with jab:
kab = when
jab = at the time when
jab Radha choTi thi = When Radha was little
jab Radha choTi thi, vo cricket khelti thi
= When Radha was little, she used to play cricket
When Amit speaks, Sushma listens =
kahaa = where
jahaa = the place where
Jahaa Amit rahta hai = (the place) where Amit lives
Jahaa mai ja-ti hu = (the place) where I go
(The place) where I live… =
(The place) where Amit lives, there Suresh also lives =
kaise = how
jaise = like how
Jaise mai kah-ti hu = As I say / Like how I say
Jaise Rohit bana-ta hai = Like how Amit makes
As Amit says =
As Amit says, please do that way =