This is not an asigment but it coul be great help to improve our english....
http://grammar.ccc.commnet.edu/grammar/prepositions.htm
http://www.inglestotal.com/prepositions-of-place-on-in-at-preposiciones-de-lugar-en-ingles-on-in-at-lesson-9
http://en.wikipedia.org/wiki/Preposition_and_postposition
http://www.shertonenglish.com/resources/es/prepositions.php
Alejandra saldarriaga
Nice, thanks for sharing this with us. I would like to learn more about the correct use of prepositions now that is a complex topic in english as in spanish too. (Paolo)
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