第2个回答 2012-07-29
on: on is usually followed by a noun(e.g. day, date)
e.g. I will go to a party on Friday.
with: with is also followed by a noun(e.g someone)
e.g. I usually go to school with Mary.
by: by is followed by a noun(e.g. transportation)
e.g. I go to school by bus.