Ответ:

В кратком ответе используется местоимение, соответствующее подлежащему вопроса:

  1. Is your house new? – Yes, it is.
  2. Are the students at the English lesson now? – Yes, they are.
  3. Is your university in Green Street? – Yes, it is.
  4. Are Helen and Bess your sisters? – Yes, they are.
  5. Is Ben's sister an engineer? – Yes, she is.
  6. Are the pencils red? – No, they are not.
  7. Is this room comfortable? – No, it isn't.
  8. Are the textbooks on the shelf? – Yes, they are.
  9. Does the girl often visit the museum? – No, she doesn't.
  10. Does this pen write well? – Yes, it does.
  11. Is Ben on holiday now? – No, he isn't.
  12. Is Helen nice? – Yes, she is.
  13. Are you an engineer? – Yes, I am.