You use :

• either ... or to talk about a choice between 2 possibilities.
• neither ... nor to join 2 negative ideas
• both ... and to join 2 ideas
• not only ...but also to add extra information <= formal
  
• Ex :
• She can see either the boss or the secretary.
• We have neither a dog nor a cat.
• Are you both a director and an actor ?
• I am not only an actor but also a director.
• He not only practises the piano but he also gives concerts.
• Test :
• Bâtir les phrases entre parenthèses avec les éléments donnés.