Do you know when to use both, either and neither?

Do you know when to use both, either and neither?

Both = this AND that
Either = this OR that
Neither = NOT this and NOT that.

Both is used with 'and' e.g. 

"Emma and Megan both went to the party." 

We don't usually use this with a negative sentence, but use neither instead.
e.g."Both of us don't swim regularly." WRONG.

"Neither of us swim regularly." MUCH BETTER!

Either is used with 'or' e.g.
"Do you want either chocolate or crisps?"

We often use neither with 'nor', although this is quite formal. E.g.
"Neither Caroline nor Marguerite worked for EC during the world cup." 

Be careful not to use neither with another negative e.g.
"I don’t want neither chocolate nor crisps." WRONG.
We cannot have a double negative!

Exercises:

In the following sentences do we use (B)oth, (N)either or (E)ither? Good luck!

• 1. I don't like Italian food, so I don’t really want to go to  restaurants.
• 2. I love  of my sisters equally!
• 3.  my brother nor my sister likes mushrooms.
• 4. I can't choose, so please can I have  of them?
• 5. Please will  you or Philippa buy some milk later?
• 6. Does  of you have a black dress I can borrow?
• 7.  of them wants to come with me so I suppose I will have to go by myself.
• 8. I'm so lucky! I went to  Spain and Tenerife this year!
• 9. I don't think England or South Africa will win the world cup this year. of them.
• 10. I can't decide what to have for dinner. I think  fish and chips or roast chicken.
• 
  

Key answers: 1)E, 2)B, 3)N, 4)B, 5)E, 6)E, 7)N, 8)B, 9)N, 10)E.

Taken from: http://www.ecenglish.com/learnenglish/lessons/both-neither-either-pre-intermediate-level