Common and simple prepositions
a at, to, by
ante before, in the presence of
bajo under, underneath, beneath
con with, by
contra against, to
de of, from, off, by,  at, with , about
desde after, from, since
durante during
en  in, on, at, into
entre among, between
hacia toward, until, to
hasta until
mediante by means of
para for, in order to, by, through, to
por by, for, to,through
según according to, by
sin without
sobre on, upon, above, about, over, around
tras after,behind
A preposition is a type of word that is used to connects words and form a phrase;  
Prepositions are relational words, so  the phrase in turn functions as an adjective or adverb
They combine with nouns or pronouns to make a phrase that refers to or modifies another word in the sentence.
and according to the thougth expressed in the sentence, it serve to indicate the relation between these words.
The prepositional phrase itself functions either as an adjective or an adverb.
A preposition is followed by an object, which is usually a noun ( the object also can be a pronoun or verb that functions as a noun) ,
 in order to indicate a relationship between that noun and the verb, adjective, or noun that follows 
Prepositions are used to indicate a relationship between two words, linking them together. 
These words usually show location, direction, distance, motion, manner or time.
 As the word "preposition" suggests, these words precede the word or words it links. 
There are simple prepositions, which consist of only one word,
 and compound prepositions, which consist of more than one word.
Prepositions are invariable: they do not have masculine or feminine, singular or plural. (  no gender, no number)
In general, prepositions are used in the following categories:
Preposition + noun:  de madera off wood
sobre papeles. on papers.
con Miguel with Miguel
sin azúcar without sugar.
Preposition + pronoun:  tras ellos after them
para mí  for me. 
delante suyo in front of you
entre nosotros among us
Preposition + infinitive:  para cambiar just for a change.
sin hablar without talk
por volver just to come back
hasta empezar till start
Verb + preposition:  estudié hasta las diez I studied until 10. 
caminamos sobre la arena We walk on the sand.
viajó durante la noche He traveled during the night
estaban delante nuestro they were in front of us

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