Using the present progressive to express future time.

(a) Tom is going to come to the party tomorrow
(b) Tom is coming to the party tomorrow
(c) We’re going to go to a movie tonight
(d) We’re going to a movie tonight
(e) I’m going to stay home the evening
(f) I’m staying home the evening
(g) Ann is going to fly to Chicago next week.
(h) Ann is flying to Chicago next week
The present progressive can be used to express future time. Each pair of example sentences has the same meaning. The present progressive describes definite plans for the future, plans that were made before the moment of speaking.
A future meaning for the present progressive is indicated either by future time words (e.g., tomorrow) or by the situation.
(i) You’re going to laugh when you hear this joke
(j) INCORRECT: You’re laughing when you hear this joke
The present progressive is NOT used for predictions about the future. In (i): The speaker is predicting a future event. In (j): The present progressive is not possible, laughing, is a prediction, not a planned future events.

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