Each Noun Phrase (NP) in the test sentence will be pre-corrected as correction candidates.
this paper describes the NLP 2 Ct Grammatical Error Detection and Correction system for the CoNLL 2013 shared task, with a focus on the errors of article or determiner (ArtOrDet), noun number (Nn), preposition (Prep), verb form (Vform) and subject-verb agreement (SVA).