Because the size of the supplied training data is too small to train an effective SMT system, we used additional data from the Cambridge Learner Corpus 1 (CLC).
we derived new pairs of incorrect and correct sentences using the publicly available scripts from the First Certificate in English (FCE) (Yannakoudakis et al., 2011) and others from the International English Language Testing System (IELTS) examinations, which include mainly academic writing.