Revision

Here there are some useful links to help you study grammar.

SIMPLE PAST  1  2  3  4  5
AND PAST CONTINUOUS 1  2  3
PRESENT PERFECT 1  2  3  4
PAST SIMPLE/ PERFECT 1  2  3  4
FOR/SINCE 1  2  3
JUST/ALREADY/YET/EVER/NEVER 1  2  3
PRESENT PERFECT CONTINUOUS  1  2  3
PAST PERFECT CONTINUOUS 1  2  3