The Differences between Big and Large

According to evident sentences provided by VLC concordancer, both large and big describe extent. However, large is often used to describe quantity; while big is used to describe greatness of something.
For instance, we can find "a large amounts of ~" more often than "a big ammount of ~ ". Meanwhile, we find big used to describe a business, businessman, brother, or chance to show their greatness. This explanation could be reliable because we can hardly find a collocation of "a large brother", "a large businessman" or "a large chance."

Greeting

I was not interested in teaching at all, neither now nor the future, I think . Being a teacher is the last thing I would do as a career; however, life is full of uncertainties, and especially, when the unemployment rate is accelerating, we can do nothing but follow the saying, "Baggars can't be choosers." Someday, I might become a teacher probably, like what Miss Lai, my teacher, did; thus, it is better to prepare and obtain more knowledge in teaching than doing nothing. Nevertheless, I am still fond of Miss Lai's class. (The attached photo was taken while I was teaching Chinese to Japanese students)

Hey!