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The Preposition 'On'
In English, prepositions are used to describe how nouns and verbs are related in terms of direction, time, position, location, and/or some other factor. Prepositions can be a great source of challenge for English-learners because each preposition often has different meanings, and some meanings do not make sense!
Here is a brief summary of some of the common and peculiar (or strange) uses of one of the most common preposition: on. Some of the uses do not make sense! You might be wondering or asking why the prepositions are used in this way. Well, even though there might be an explanation for some of the strange usages, most native English-speakers do not know the origin or meaning of theses weird prepositional uses...and they most likely don't care; they just know how and when to say them correctly!
'On' is most often used for specific days or dates:
My last day at work is on Friday.
School starts on September 7.
When we talk about an amount of time that is not on a special date, but is a good example of other times similar to it, we use 'on'.
On a sunny day like this, everyone should be outside playing!
(This day is an example of many beautiful sunny days that exist in the world)
There are many things to do on a Saturday night in this city!
(Every one single Saturday night in that city has many things to do)