Present perfect tense:
1.Tim (not/come)...........to the pasty yet.
2.They (live)..........................here since they were ten years old.
3.I (know)....................................Greg Adam for three years.
4.So far this week , I (have)...................two tests and a homewwork.
5.How long (you/know)...........................each other?
6.My sister (just/leave)...........................her house.
7.-How many books (you/buy).......................since the beginning of the semester?-I (buy)........................a lot of books.
8.Up to now, Professor Williams (give)......................our class 5 tests.
9.They (not/meet).......................each other since last week.
10.-(Tom and David /be)........................best friends for 9 years?
-No , they (become).............................best friends since last year.
11.I wonder where he (live)............since then.
12.I (try)...............to learn English for years , but I (not/succeed)....................yet.
13.I (wait).............here for him since seven o'clock and he (not/come)............yet.
14.My father (work)..............in this company for 5 years.
15.These stundents (study)..................English for 4 years now.
16.So far I (get)..................married for 5 years.
17.She (not/see)...............me since last week.
18.I....................never(eat)...................this food before.
19.This is first time I (meet)..................such a famous person.
