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'I am going to do something' = I have already decided
to do it, I intend to do it:
- A: There's a film on television tonight. Are you going
to watch it?
- B: No, I'm tired. I'm going to have an early night.
- A: I hear Ruth has won some money. What is she going
to do with it?
- B: She's going to buy a new car.
- A: Have you made the coffee yet?
- B: I'm just going to make it. (just = right at this moment)
- This food looks horrible. I'm not going to eat it.
I am doing and I am going to do
We normally use I am doing (present continuous)
when we say what we have arranged to do -for example, arranged
to meet somebody, arranged to go somewhere (see Unit 19):
- What time are you meeting Ann this evening?
- I'm leaving tomorrow. I've got my plane ticket.
'I am going to do something' = I've decided to do it (but
perhaps not arranged to do it):
- 'The windows are dirty.' 'Yes, I know. I'm going to clean
them later.' (= I've decided to clean them but I haven't arranged
to clean them)
- I've decided not to stay here any longer. Tomorrow I'm going
to look for somewhere
- else to stay. Often the difference is very small and either form
is possible.
You can also say that 'something is going to happen' in the
future. For example:
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The man can't see where he's walking. There
is a hole in front of him.
He is going to fall into the hole.
When we say that 'something is going to
happen', the situation now makes us believe this. The
man is walking towards the hole now, so he is going
to fall into it.
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- Look at those black clouds! It's going to rain. (the
clouds are there now}
- I feel terrible. I think I'm going to be sick. (I feel
terrible now}
'I was going to (do something)' = I intended to do it but
didn't do it:
- We were going to travel by train but then we decided
to go by car instead.
- A: Did Peter do the examination?
B: No, he was going to do it but he changed his mind.
- I was just going to cross the road when somebody shouted 'Stop!'
You can say that something was going to happen (but didn't
happen):
- I thought it was going to rain but then the sun came out.
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