|Unknown author (I'm not lying)|
Go to the OXFORD ONLINE LEARNING ZONE.
It's time to do some exercises on PAST TENSES. Look for the section called PRACTISE YOUR ENGLISH and do the following exercises:
Past Simple - Past Continuous: 3-4
Past Simple - Past Perfect: 7-8
Present Perfect - Past Simple: 11-12
You must do the exercises before December 22nd, 2016.