Syntax
Question tags
 Use question tags (with a falling intonation)
  to check facts. They are made with auxiliary verbs. Use a negative tag with
  a positive sentence and a positive tag with a negative sentence. 
 Be
  -  I am ..., aren't I?
 
  -  She isn't ..., is she?
 
  -  You were ..., weren't you?
 
  -  He wasn't ..., was he?
 
 Can
  -  We can ..., can't we?
 
  -  She couldn't ..., could she?
 
 Do
  -  I do ..., don't I?
 
  -  She swims ..., doesn't she?
 
  -  We ate ..., didn't we?
 
  -  They didn't see ..., did they?
 
 Have
  -  You haven't got ..., have you?
 
  -  She has eaten ..., hasn't she?
 
 When have is a full verb, use the auxiliary do.
  - They have dinner, don't they?