Prepositions are amongst the most difficult things in the English language. They are mostly abstract in concept and they are hard to place correctly. They are different than adjectives which indicate qualities such as blue, long, short, making their nature rather imprecise in our heads. Here are some pictures that will help you understand when to use «on» or «in» accordingly. DO YOU HAVE ANY DOUBTS ABOUT SPECIFIC USES OF A PREPOSITION? SHARE IT WITH US, WE’LL FIGURE IT OUT FOR YOU.