问题: COULD BEING /HAVE DONE ,,,?
Why are you wasting time ? You could being finishing your work.
你可能快把你的工作做完了。
Why are you wasting time ? You could have finished your work.
你可能已经把你的工作做完了
后面的句子是我自己加的，大家看看我翻译的对吗？
解答:
The first sentence is not correct, it is not proper English.
Your sentence is better, you can also add "your" and "earlier" at the end of the sentence:
Why are you wasting your time? You could have finished your work earlier.
Or why are you wasting your time? You should have finished your work.
I hope it will help.
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