like le and de, ja also adds nuance
Let’s first review the ja conjugation:
Sita jati hai, Sita jaegi, Sita gayi
= Sita goes / Sita will go / Sita went
Amit goes =
Amit will go =
I will go =
ja also adds the nuance of completion / finality:
Radha jati hai = Radha goes
add samajh = understand (no conjugation)
Radha samajh jati hai = Radha understands finally = Radha gets it
Amit sleeps finally =
We can use the same idea for the future tense:
Radha jaegi = Radha will go
just add uTh = wake up (no conjugation)
Radha uTh jaegi
= Radha will finally wake up (and proceed to the next activity)
Amit will finally sleeps =
and similarly for the past tense:
glass ga-ya = the glass went
just add TooT = break (again, no conjugation)
glass TooT ga-ya = the glass broke
Suresh went =
Suresh finally ran away (bhaag) =