1) Advanced Language Practice by Michael Wince with Peter Sunderland;

2) Practical English Usage by Michael Swan;

3) Longman English Grammar for Intermediate Students;

You can also use:

4) English Grammar in Use by Raymond Murphy

5) Advanced Grammar in Use by Martin Hewings.

GRAMMAR: Past Simple versus Past Continuous

ВИДЕО: Present Perfect

ВИДЕО: Past Continuous (for writing an article, see 26 02 Homework). Use Transition phrases to join the ideas in your article: