Question

c) i got the flu on monday. It's now wednesday.
d) my brother became a student when he was five years old.
e) Arnold started studying english last month.

Answer 1

b) Janet and Lucy are friends since January.
c) I have had the flu for three days.
d) My brother is a student since he was five years old.
e) Arnold has studied for a month. 
Acho que é isso! :)