#3Corpus Linguistics

I think the difference between "big" and "large"is
"big" used to describe something that have real form,actually exist or easily image.
for example
big band , big boy , big apple , big success
"large" to describe number,quantity or something that hard to show it.
just like
large sum , large proportion , large number of , large amount of

but not absolutely follow this rule.
sometimes these two words have the same meaning in usual life/informal.
big/large city , big/large sth.