Prepositions are a class of words that indicate relationships between nouns, pronouns and other words in a sentence. Most often they come before a noun.
The good news is that they never change their form, regardless of the case, gender etc. of the word they are referring to
Prepositions are classified as simple or compound.
Simple prepositions are single word prepositions - across, after, at, before, between, by, during, from, in, into, of, on, to, through, under, with and without are all single word prepositions.
Compound prepositions are more than one word - in between and because of - are prepositions made up of two words - in front of, on behalf of are prepositions made up of three words.
Prepositions can be used to show movement. For example: to, through, across.
We use to to show movement with the aim of a specific destination.
We use through to show movement from one side of an enclosed space to the other side.
We use across to show movement from one side of a surface or line to another.
Prepositions can be used to show where something is located.The prepostions - at, on, in
We use at to show a specific place or position.
We use on to show position on a horizontal or vertical surface.
We also use on to show a position on streets, roads, etc.
We use in to show that something is enclosed or surrounded.
We also use in to show position within land-areas (towns, counties, states, countries, and continents).
Prepositions can be used to show when something happens. (time, day, date, month, year, morning, afternoon, evening,night, season)
Prepositions of time - at, on, in.