3.

a)Jenniefer has worn these glasses for two years. 
b)The famous actor hasn't arrived yet.
c)Jeans have become a fashion item nowadays.
d)I haven't heard Peter since from last Sunday. 
e)The girls have walked for two hours. 
f)The reporter has interviewed Michael. 
g)Sonia has already celebrated the festival. 
h)Beth hasn't danced for a month.
i)Stephen has gone swimming.
j)The mother has protected her sons. 

4.

a)Mr. Jones has been working for my father for 15 years.

b)Juliette started to teach at the school in 2009.

c)The girls have just been asking the teacher some questions.

d)Christopher wanted to buy the iPod yesterday.

e)Matthew travelled to Germany 3 weeks ago.

f)Hector has understood the problems already

g)Alice drank a glass of orange juice

h)She hasn't washed her hair this morning

i)Nuria enjoyed the school play last Saturday

j)Lawrence took the books to the library

a) Jennifer has worn these glasses for two years.

b) The famous actor hasn't arrived yet.

c) Jeans have become a fashion item nowadays.

d) I haven't heard from Peter since last Sunday.

e) The girls have walked for two hours.

f) The reporter has interviewed Michael.

g) Sonia has already celebrated the festival.

h) Beth hasn't danced for a month.

i) Stephen has gone swimming.

j) The mother has protected her sons.

4.

a) Mr Jones worked for my father 15 years ago.