Tail questions. An exercise.

e.g.-Mary is beautiful, isn't she? ( Η Μαίρη είναι όμορφη, έτσι δεν είναι; ...ε; )
      -Mary isn't beautiful, is she?
      -He works hard, doesn't he?
      -He doesn't work hard, does he?
      -They went to the theatre yesterday, didn't they?
      -They didn't go to the theatre yesterday, did they?
      -You will leave for Africa next week, won't you?
      -You won't leave for Africa next week, will you?
      -I am tall, aren't I? 
      -I am not tall, am I?

Click on the picture to do the exercise.