We use the future simple tense when
there is no plan or decision to do
something before we speak. We make the
decision spontaneously at the time of
speaking.
I need to get my medicine. I will go to the pharmacy tonight.
We often use the future simple tense
to make a prediction about the future.
We are saying what we think will
happen.
I’m sure it will rain tomorrow.
Form
We form the simple future with "will" and the
"base form of the base form of the verb"
When we use the future simple tense in speaking, we often contract the subject and auxiliary verb
Subject + will / ´ll + verb + complement
Subject + will + verb + complement
For negative sentences in the future simple tense, we insert "not" between the
auxiliary verb and main verb.
For negative sentences in the future simple tense, we contract with
won't
Subject + will not / won´t + verb + complement
For question sentences, we exchange the subject and auxiliary verb.
Will + subject + verb + complement + ?
Be going to
Use
To talk about our future plans end intentions
I’m going to learn English
To make predictions based on what we can see or know
Lucy is very good at science. She is going to study medicine.
Form
We form the affirmative with the verb "to be + going to" and the based form of the verb
Subject + the verb to be + going to + verb + complement
We form questions by putting the verb "to be" before the subject
the verb to be + subject + going to + verb + complement + ?
For negative sentences by putting "not" after the verb "to be"
Subject + the verb to be + not/n´t + going to + verb + complement