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I would like to know the difference between past perfect continuous and past continuous in these examples:

  1. We were playing tennis when it started raining.
  2. We had been playing tennis when it started raining.
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closed as general reference by Kris, Manoochehr, Matt E. Эллен, jwpat7, kiamlaluno May 17 '12 at 13:35

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

I think the question is general reference. – Paola May 16 '12 at 4:18
An article at wikipedia – Matt E. Эллен May 16 '12 at 8:36

The first means that at the instant it started raining, you were playing tennis. The second means that at the time it started raining, you were already playing tennis for some indefinite period of time.

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