How to use a prepositions?
1. The prepositions usually comes before the noun.
2. Prepositions can be used with all forms of nouns (e.g. collective nouns, pronouns etc).
3. Prepositions can't come after a verb, but can be used before a gerund or verb in noun form.
4. The rules above do not change and there are no exceptions to the rules.- See more at: 
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My friend Githu prepostions is very easy. i will tell you easiest methods to use it
 1. Always it comes before the noun .
2. it can used be used with all the forms of noun.
3. rule is there that it can't come after the verb.
So, I thinked that now you now the answer.