This picture is excellent to learn about the Past Cont., everything is clear enough! Now, let's pay attention to this ...
As I told you in class, here you can find a lot of exercises and worksheets, it's very easy, just click on the following links.
One, two, three, GO!!!!!
1. Past Cont. (IES Libertas)
2. macmillaninspiration - Past Cont.
English Plus 2 -
Oxford University Press PHOTOCOPIABLE Worksheets:
1. Unit 4 - Grammar & Vocab. 1*
2. Unit 4 - Grammar & Vocab.2 **
3. Unit 4 - Grammar & Vocab. 3***