I always make mistakes in preposition choosing. Would you give me some suggestions in details?
I am so sorry I have forgotten the original sentense. Eould you show me some examples of the typical correction for mistaken preposition use?

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Answer

Hi, Iris!  It's a hard subject... 
There are  in this website some briefly explanations for the use of different prepositions: 
http://www.english-4u.de/grammar1.htm
http://www.english-4u.de/
You can also find some exercises and examples there.  Hope it helps

Answer

It is not little material. Prepositions take important role in english and you ought to learn rules of using them.