Thank You Dear Beeesneees, could you please tell me one more thing:
I think 5th sentence we can write in two possibilities, one as above with your reply:
5a) By the time George hascompleted his Ph.D., his sister-in-law will have been managing her department for 20 years.
or:
5b) By the time George completed his Ph.D., his sister-in-law had been managing her department for 20 years.
analogically to: for example:
By this time the children went to school we had been living there for nearly 15 years.
What do you think? So the error can be : ‘completed’ or ‘will have been managing’, but how could I know which error the author of this sentence meant??
I meant the same analogy between these two sentences including Past Simple, and Past Present Continuous:
By the time George completed his Ph.D., his sister-in-law had been managing her department for 20 years.
and
By this time the children went to school we had been living there for nearly 15 years.
The original sentence which inludes an error is:
5. By the time George completed his Ph.D., his sister-in-law will have been managing her department for 20 years.
So if we look at it we find two possibilities of error, it could be ,completed’’ or ,will have been managing’’, so we receive 5a) or/and 5b), but how do we know which one the author meant? Do you understand me better? I think in the exam we can explain these two possibilities and our understaning…
The original exercise, question 5, indicates that the mistake is with the first verb, not the second one.
In that sentence only ‘has completed’ works with ‘will have been’.
He hasn’t completed his degree yet. She hasn’t been managing the department for 20 years yet.
Dear Beeesneees, I 'd like to emphasise that it wasn’t given at first where the error is. If the author of this sentence indicated the error , so I would know which possibility is true.
Of course the author of this sentence is deciding, but the reader must first indicate this error and then correct it. So, I’m the reader who noticed two possibilities of error and that’s why I see two possibilities of answer.