

Some of the most common and essential prepositions are In, On, At.
For example:
IN
In 2006
In the 1990s
In Latvia
In the morning
In the afternoon
In the evening
In the future
In summer
In winter
In autumn
In fall
In spring
In the Easter holiday
In Paris
In Edinburgh
In conclusion
In common with
In a mess
ON
On that day
On the 7th of July
Onboard
On trial
On a birthday
On a holiday
On this Thursday’s eve
On a weekday
On a bike
On a plane
On a ship
On the corner
On bail
On a pension
On a certain scale
On an expedition
AT
At 7:00 sharp
At a loss
At university
At length
At bedtime
At a price
At a rate
At dinner time
At gaming
At singing
At One’s side
At home
At a conference
At reception
English prepositions are highly important due to their function of connecting the parts of every single sentence. The meaning of any sentence and the target of every verb can’t be delivered without this connection carried out by the preposition.
The difference in their use is quite simple and easy to learn. It is a range in which we use the preposition “in” when we have a wide span of time, while “on” is used precisely when there is a specific day that is being mentioned. However, when we desire to achieve even more precision, we resort to “at” that pinpoints a specific time or place with surgical precision.
There is also as we see the metaphorical use of all the previous three prepositions. By metaphorical use, we mean that those prepositions do not necessarily pertain to physical space rather they can be used to express general non-materialistic states.
For example, in an uproar at his recent activities, this phrase represents a psychological state by a group of people who are infuriated by certain acts committed by a person. The same applies to the other two prepositions.
You can see that in the following examples:
They worked in silence. It does mean that they are working amidst a state of silence. Silence is being materialized here as something to be in, but it is still something that you cannot grasp, see, hear, or taste. It is only an obscure feeling of the voidness of sound. It is the absence of sounds, but it does not mean we can catch it. See also https://bit.ly/3Fa7nNZ
Karl built his hypothesis on false facts. The facts are to be understood, they are being materialized by blocks in this sentence, but that shows you too how the preposition on can work even in sentences with no physical layout.
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