In addition to the simple future we can talk about future events by using either:
These two forms are used to talk about future plans. There are, however, some differences between the two forms.
The present continuous is used when we say what we have planned and arranged to do at a specific time in the future. These are fixed plans with definite time and/or place.
- I'm doing my homework this evening.
- I'm starting university in September.
- Sally is meeting John at seven o'clock this evening in a restaurant downtown.
A. We use 'going to' to express the future when we intend to do something or have decided to do something but did not arrange it. It is just an intention.
- A: The windows are dirty.
B: Yes I know. I'm going to clean them later.
= I've decided to clean them ,but I haven't arranged to clean them.
B. We also use 'going to' to make predictions.
- Watch out! you are going to break the glass.
- It's so cloudy! I think it's going to rain.