A: There aren't any direction finding units (DF) in this region anymore.
B: Where have they all gone?
Present Perfect Simple
The Past & Present
As we studied in Unit 7, English speakers use the Present Perfect to connect the past with the present. The Present Perfect always gives information about the present:
We've run out of spare radios. Let's go to maintenance to get some more.
You've embarrassed her. Now she's crying.
Steve isn't here. He's gone home for the day.
Passive
The passive form of the Present Perfect is have / has + been + past participle:
The central computer room door has been closed. That's why it's a little warmer in here.
We need to call a DSC (data systems coordinator). One of the DME (distance measuring equipment) facilities has been broken into.
Your ATC (air traffic control) application has been denied. I'm sorry.
New Information
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