III- 1- How long have my parents known the Mayor?
2- How long have been our teacher ill?
3- How long have I gotten a headache?
4-How long have David Mech worked in an American lab?
5-How long have had your brother a new job?
6-How long have he been married?
7- How long have he lived in Switzerland?
8-How long have you been looking at my car?
IV-1-It has been 60 years since my grandparents got married.
2-How long have you had a dog?
3-He have been sick since this morning.
4-I haven’t got my ticket yet.
5-The neighbors have went to the concert.
6-Have you already done your essay?
7-How long have you known your English professor?
8-I haven’t been here for long, I just got here.
