Hello colleagues, One of the hardest aspects of English for learners to acquire is prepositions. Why do we get on a plane, on a train and on a bus, but in a car and in a truck? Is it because we use steps for planes and buses? But -- wait! -- we don't always use steps when we get on a train! And big trucks usually have a step or two. 
What tips can you share for teaching prepositions? Please let us know if you know of useful online resources, too!
Cheers, Susan Finn Miller
Moderator, English Language Acquisition CoP