EITHER - NEITHER

http://www.ego4u.com/en/cram-up/vocabulary/both-either-neither-nor

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-46155.php

http://www.myenglishgrammar.com/english/lessons/lesson-20--either-and-neither.html

http://www.slideshare.net/yilmazman/both-either-neither-presentation

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-46155.php