How many prepositions are there in English?

Could you explain about theory of prepositions ?

generally in and on are used as prepositions of transportation, then how is by used

can u tell me examples of prepositions. like of, for, it, the.

Hello :) Can you tell me if "as far as" and "in case of" are prepositions? Thanks!

Hello How to explain prepositions to a 9 year old boy? Thanks!

Hi.Does anybody know why motion prepositions have deletable objects? Is it true in all cases? Or does it depend on the meaning of the prep.? qgaby

The bodies were found inside an apartment [at/in] the the Edward Gay complex a block [off/away from] the LSU campus. Which of the prepositions are correct? Thanks in advance!

hi again! Are these prepositions correct? A scene of an Impressionist painting. (or should I write from an Impressionist p) The author is left inbetween the poetic house of the lyric and the narrative....(is 'inbetween' correct?) Thanks

Hopefully, you would help me. I'm not happy in my job. (in an activity) I'm not happy with my result. (with sth received) I'm not happy about the delay. (about a situation) something wrong with the prepositions?