How many prepositions are there in English? It is not possible to give a definite answer, partly because complex prepositions are "open class", which means that new ones could be invented at any time. But for a list of almost all the one-word and complex prepositions in common use, there's a book called "English Prepositions", which gives a list of all 150 English prepositions, including 94 one-word and 56 complex prepositions.
There are more than 100 prepositions in English. Yet this is a very small number when you think of the thousands of other words (nouns, verbs etc). Prepositions are important words. We use individual prepositions more frequently than other individual words. In fact, the prepositions of
are among the ten most frequent words in English. Here is a list of 70 of the more common one-word prepositions (Click on the link below). Many of these prepositions have more than one meaning. http://www.englishclub.com/vocabulary/prepositions.htm