Question

How do we know where to use what prepositions??

Answer 1

A preposition is a word that explains the time, space or logical relationship between the other parts of the sentence. In other words, it links all the other words together, so the reader can understand how the pieces of the sentence fit. Ex-updownnearfarbyataroundclosealways

Determining the correct preposition to use can be a tricky proposition.  This can be especially difficult when dealing with idioms – expressions in the English language that don't necessarily make sense when taken literally. Idiomatic expressions are expressions you just have to memorize, and when errors are made, they are almost always preposition errors. 

Here are some examples of idioms, along with the correct prepositions:

Able to
Capable of
Preoccupied with
Concerned by
Prohibited from