at vs in

  People get very confused about these two prepositions, but there are a couple of simple tips you can use to help yourself remember how to use them.

  In, as a preposition of place, is usually used to talk about the position of someone or something inside large places such as countries, continents, big cities etc.

  For example:-

  She grew up in New Zealand.

  At, as a preposition of place, is usually used to talk about the position of someone or something inside small and unimportant places such as villages, small towns etc.

  For example:-

  I'lll meet you at the pub.

  At is also commonly used with proper names such as buildings or organizations.

  For example:-

  I first met her at Harrods.

  She works at the bank.

  In, as a preposition of time, is usually used when talking about parts of the day.

  For example:-

  I'll see you in the morning, in the evening, in the afternoon.

  At, as a preposition of time, is usually used with clock time.

  For example:-

  My train leaves at 6.30 am.

  ♦ !Note - As with most so called "rules" in English there are exceptions, so just to confuse you we always say "at" night.