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Help the picnickers react to the sudden change in weather.
"Uh oh, look at those huge, dark clouds rolling in! It ___________________________ very soon. We ___________________________ completely soaked if we don't pack up the sandwiches right now!"
It is going to rain very soon. We are going to get completely soaked.
We use "going to" to make predictions when there is clear physical evidence in the present moment (like dark clouds showing that rain is about to happen).