Play with bricks for a couple of weeks,
and the right grammar forms will appear in your mind automatically in every proper case.
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Stacks is a simple and powerful kit to learn English tenses with 12 grammar bricks only.
3 levels to go - from 7 tasks in the easiest one up to 5 in the others.
4th level is to practice and test to make your grammar use self-acting.
It's even possible to solve each task just by picking out the bricks and their sides.
If you face some troubles don't hesitate to press [Help] - you won't miss anything.