Question

Why we use since last night instead of for?

Answer 1

Hey friend!

Since last night will mean last night se and for last night will mean last night ke lie

I hope it's clear

Answer 2

Since can refer to a point after a specific time or event in the past. ... When using since, we normally use present perfect and past perfect tenses in the main clause of the sentence. You wouldn't use since when you are talking about the future because, by definition, since refers to specific point in the past.

HOPE IT HELPS YPU DEAR.BE BRAINLY. :)