A. -- OK B. ' Past perfect makes clear the time order of an earlier event .
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I'm having issues trying to understand this as well.
Someone wrote:
"We didn't disturb him (2nd action) until he had finished his job (1st action) RIGHT but B is wrong
I had not understood the problem (1st action) until he explained it (2nd action). RIGHT"
Well, the fact that I avoided disturbing him is prior to him finishing his job.
As regards the s