Incorrect usage of prepositions in English is like driving your car at night with the headlights off. You can't find the way in darkness. English prepositions. Exercises Part 3 illuminates the way by being the most definitive resource for English learners at all levels. With this self-study guide, you will be able to broaden and test your knowledge of such prepositions as out of, off, on, onto, over, to, under, until, till, with.