10. We haven’t been to the concert for over a year. - It is ______________________________________________________________________________ 11. It is 2 years since we last saw our grandparents . - We haven’t ________________________________________________________________________ 12. They have worked in that factory since 2001. - They started_______________________________________________________________________ 13. It’s weeks since I last cleaned my room. - I ________________________________________________________________________________ 14. We have made her birthday cake for 2 hours. - We started________________________________________________________________________ 15. It’s nearly two weeks since my father last phoned me. - My father_________________________________________________________________________ 16. My father started to give up smoking last year. - My father has______________________________________________________________________