Prepositions: at/on/in (time)

English/Inglês
At / on / in (time)

Explanation/Explicação
These prepositions can be used to describe time, however we used them according to the period of time we want to talk about.

• We use at when we talk about the time of the day.
  Example: The flight leaves at 4.30pm.
  
• We use on when we talk about days and dates
  Example: I don’t work on Fridays
  
• For longer periods of time like months, years or seasons we use in.
  Example: I was born in January.
  
• We can also use the preposition at with these expressions.
  

1. at night
   
2. at the weekend / at weekends
   
3. at Christmas / at Easter
   
4. at the moment / at present
   
5. at the same time

NOTE: When asking for the time we usually use “what time” not “at what time”.

• We use in when we what to talk about the morning, the afternoon or the evening:
  Example: See you in the morning.
  
• But we use on if we want to talk about the same period of time but on a specific day
  Example: I’ll talk to you on Friday morning.
  
• We do not use any of these proposition before last/next/this/every
  Example: I’ll talk to Andrew next Sunday.
  
• When we talk about a period of time in the future, we use in. It is also used to say how long it takes to do something
  Examples: The train will be leaving in a few minutes
  I’ll be the in a moment.
  George will be graduated in a week.
  They are moving out in six months’ time (or in six months).
  I finished the entire project in eight weeks.  
  

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