We refer to two or more errors appearing consecutively as serial errors. Previous
work on grammar checkers either focuses on handling one common type of errors
exclusively, or independently. However, if an error is not isolated, it becomes difficult to
correct the error when another related error is in the immediate context. In other words,
when serial errors occur in a sentence, a grammar checker needs to correct the first error in
the presence of the second error (or vise versa), making correction hard to solve. These
errors could be corrected more effectively, if the corrector recognized them as serial errors
and attempt to correct the serial errors at once.
Consider an error sentence “I have difficulty to understand