Question :
Find out the erroneous part
Since last night, he is reading a book which has been authored by a celebrated writer.
Option 1: Since last night, he
Option 2: is reading a book
Option 3: a celebrated writer
Option 4: No error
Option 5: which has been authored by
Correct Answer: is reading a book
Solution :
The sentence needs 'has been reading' as the starting point of the activity is given and the action is still continuing.