A: There aren't any fish in this lake 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 milk. Let's go to the store 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 door has been closed. That's why it's a little warmer in here.
We need to call a repair company. One of the car windows has been broken.
Your application has been denied. I'm sorry.
New Information
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