Prepositions may be the most difficult aspect of English grammar to learn, as using them is not a matter of simply memorizing some simple rules. Click on the links below to access a variety of resources on using prepositions in English.
TalkEnglish.com devotes a page to the three most common Prepositions “On,“ “At,“ and “In.“
English Grammar Online has a page of rules and links to several practice exercises on quantifiers.
Perfect English Grammar has a page describing the rules for using prepositions, and a series of exercises to practice what you’ve learned
GrammarBook.com also has a set of rules for prepositions.
Englishpage.com offers many practice exercises on Prepositions and Phrasal Verbs.