Present perfect tense

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Present perfect tense (Statements)
A : I have sent you lots of text messages this week . You haven’t answered any of them .
B: I haven’t looked at my phone much this week . 
A: Why not?
B: I’ve been on vacation !!
Ex:
Joanna has sold life insurance for six months 
1. I used to see her every day, but I haven't seen her since she started her new job.
Richard has owned his own business since he moved to Ohio.
The unemployment rate has decreased 15 percent to 9 percent.
Substantially. (subistenthôlí) Substancialmete .