Prepositions are not as scary as they appear! They are mostly logical in that they follow some basic principles and most have a complementary preposition with an opposite meaning. So, sit back and relax as we introduce you to these principles.
Prepositions: Locators in Time and Place
A preposition describes a relationship between other words in a sentence, locating something in time and space, modifying a noun, or telling when or where or under what conditions something happened.
Prepositions that describe location
The most common use of prepositions is in describing the location of an object, person or place in relation to another object, person or place.
For example: The World Trade Center is on Av. Nações Unidas, next to the River Pinheiros and one block from Av. Berrini.
Most prepositions that relate to location obey two basic principles: they relate to a surface or they relate to a volume. For example, a table is considered a two dimensional surface: