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Hello.
I can't understand the difference in meaning between "be going to be doing" and "will be doing" in the future continuous. What is it? I have read in an english grammar book that there is a little difference between them, but I don't know what it is.

- They are going to be playing tennis in the afternoon.
- They will be playing tennis in the afternoon.

Thanks.
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No difference in meaning. Some will argue that there is a difference in the time reference, but there clearly is none here with the inclusion of "in the afteroon".
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See some of the posts by CalifJim in these threads:
http://www.EnglishForward.com/search/pro.htm?q=user:califjim going will
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Comments  
Hello.

And what would be like the difference in the time reference with another example?

Thanks.
 Marius Hancu's reply was promoted to an answer.
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