This document discusses different ways to express future events in English using "be going to", "will", and "to be + verb-ing". It explains that while "be going to" and "will" can both predict the future, "be going to" implies a preconceived plan or decision made at the moment. Meanwhile, "to be + verb-ing" refers to fixed arrangements that have already been made. Examples are provided to illustrate the different uses and meanings of each construction.

1. The Future
(be going to / will)
• "Be going to" and "will" are used to express future time.
E.g : Mary is going to succeed because she works hard.
Mary will succeed because she works hard.
 "Be going to" and "will" are the same when they are used to make predictions about the future
like the examples above. However, they sometimes express different meanings.
 "Be going to" (but not "will") is used to express a preconceived plan.
E.g : I bought some wood because I am going to build a bookcase for my apartment.
 "Be going to" (but not "will") is used to express decisions taken at the moment of speaking.
E.g : This chair is too heavy for you to carry alone. I will help you.
There is another way of expressing future:
SUBJ + TO BE + verb-ING + COMPL
Ex : I am cleaning my house next Monday because I already asked for that day at work.
 Such structure is used to express fixed arrangements.
Ex : She already has her ticket. She is leaving on the 7:15 plane on Saturday morning.