If you know how to use the present progressive correctly to express present actions, you will as well be able to use the past progressive correctly to express past actions.
(You can click in the pictures below to see in a large size)
From: http://www.ego4u.com/en/cram-up/grammar/tenses-graphic
To practice with some grammar tests, please visit: http://www.ego4u.com/en/cram-up/tests
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