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1 - My colleague hasn't entered data into the system yet

2 - I have just retrieved the information from the database

3 - We connected office equipment to LAN yesterday

4 - My brother entered university in 2014

5 - We didn't work last week

6 - Did you go to the cinema last week?

7 - Have you installed a new software yet?

8 - Has he switched on the computer yet?

9 - They have already unplugged all the computers

10 - I have already watched this film

11 - The lecture hasn't begun yet and the students are talking in the classroom

12 - The computer technicians set up a network last week