for...
duration of time
example. for two hours, for ten years, fof two days.
it is used in point of time (p.o.t)
for example.for an hour( ek ghnte k liye / ek ghnte tk)
it also used in time expression(T.E)
for example.for an hour ( ek gnte se )
since....
point of time.
example. since morning, since 1990.....
it is used in time expression (T.E)
used before definite time
example. since july, since monday, since morning.
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