when you are learning a new preposition , read many examples about it for example the preposition " in " 1- at a point within an area or a space: a country in Africa The kids were playing in the street. It’s in that drawer. I read about it in the paper. 2- within the shape of sth; surrounded by sth: She was lying in bed. sitting in an armchair Leave the key in the lock. Soak it in cold water.

that would be a long topic to discuss. try these links: http://www.arts.uottawa.ca/writcent/hypergrammar/preposit.html http://www.englishpage.com/prepositions/prepositions.html :)

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here you can learn about English Prepositins http://www.englishlanguageguide.com/english/grammar/preposition.asp http://www.ego4u.com/en/cram-up/grammar/prepositions http://www.englisch-hilfen.de/en/grammar_list/prepositions.htm preposition usage http://esl.about.com/od/grammarintermediate/a/nouns_prepositions.htm