One of the big problems with English language I have is how to use prepositions.
I found a pyramid which clearly show when we have to use prepositions "in", "on" and "at".
http://www.reallifeglobal.com/wp-content/uploads/2014/02/in-on-at.png
I'll try describing this pyramid with some examples.
The base of pyramid that is associated with something large contains the proposition "in".
We need to use "in" when we speak about extensive periods of time like centuries, decades, months, in the future.
Example: I am going to get married in the very near future (or in the third week of April).
We have some exceptions in that case like in the morning, in the evening and in the afternoon and also in five minutes.
In the middle of the pyramid we can see the proposition on which we use when speaking about the smaller periods of time.
Use it when you speak about days of week and dates.
On my birthday, on July 5th, on Friday.
However, be careful with "at night" and "at midnight".
American people also speak "on the weekend" whereas in UK they use another preposition with this word: "at the weekend".
At the bottom of the pyramid we can see "at" that is used for the smallest periods of time like hours and specific events.
Examples: at sunrise, at dinner, at 9:00, at the start of the party, at the moment.
August 2016
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