Grammar - Prepositions with cities/countries

In French, prepositions with countries and cities are going to change according to the rules below:

• for cities/towns/villages, use à:
  J’habite à Londres. (I live in London.)

• for feminine countries (countries ending with the letter -e), use en:
  J’étudie en France. (I study in France.)

• for masculine countries (ie not ending with -e or -s), use au:
  Je travaille au Brésil. (I work in Brazil.)

• for plural countries (ie ending with -s), use aux (the -x is silent):
  Je suis né aux Pays-Bas. (I was born in the Netherlands.)