Simple Future Tense

1. Positif
Subject + will/shall + verb I + object
Subject + am/is/are + going to + verb I + object

Example:
We will go to school soon
The students are going to have a test next month

2. Negatif
Subject + will/shall + verb I + object
Subject + am/is/are + not + going to + verb I + object

Example:
We will not go to school soon
The students are not going to have a test next

3. Question
Will/shall + subject + verb I + object
Am/is/are + subject + going to + verb I + object

Example:
Will we go to school soon ?
Are the students going to have a test next month ?

Be going to be used in expressing something that will happen in the future with the starting point of the present.
Meanwhile, will / shall be used to express an event that will happen. However, will / shall be used for things other than plans and promises, so just used in a general context are not inevitable. Will it be to mention details about what will happen