It was obvious that they had been playing football in the park. » Now this moment is in the past. And they played footbal even before that moment.
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Onh1986What do we put Present Perfect Continuous in this not Present Simple?
-It is obvious that they have been playing football in the park.
It's continuous because the author wants to give the reader, in this case, the feeling that the action took place over some time, and continued for some time; it is present perfect because it's related to the present