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Originally Posted by eric2004 I'm going to travel overseas.
I shall (will) travel overseas.
I will be traveling overseas.
I am about to travel overseas.
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The difference in usage has mainly to do with context. It also has to do with the amount of certainty the speaker feels about what is going to happen. With the first one ("I'm going to travel overseas") the speaker is fairly certain that it is going to happen. Also, while the time of departure could be as much as a year away, it could be within the next week. The second one ("I shall (will) travel overseas"), I think, expresses less certainty, and the time of possible departure is probably more distant than the other one. The third one ("I will be traveling overseas") expresses great certainty, and the speaker is probably fairly certain of his destination. (Perhaps his travel plans are work-related.) The fourth one ("I am about to travel overseas") not only expresses certainty, but also the departure time is probably qute soon.
:)