Salut!
Ex. 4 - since/for
a) since
b) for
c) for
d) since
e) since
f) for
Ex. 5 - How long ...
b) How long has Stewart tought English?
How long has Stewart been teaching English?
c) How long has Di been married to Charles?
d) How long have you and Nick looked for somewhere else to live?
How long have you and Nick been looking for somewhere else to live?
e) How long have you been sitting on the stairs?
f) How long has she had that job with the BBC?
Ex. 6 - Present Perfect simple or Continuous?
a) We have lived in Nigeria for 10 years.
b) The children have been watching TV since 6 p.m. (for 3 hours).
c) Francis has bought that bicycle for a year.
d) Joanne has been doing her homework since she got home.
e) She hasn't had a holiday for two years.
