Here the teacher gives a brief overview of the uses of the ‘going to’ future tense. This tense is formed: Subject + verb to be “am/is/are” + going to + base verb.
The two uses for the ‘going to’ future are:
To talk about future plans/ intentions made before speaking.
They are going to watch a film.
Predictions based on evidence.
(Looking at dark clouds overhead) It’s going to rain.
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