4. The method of claim 2 , wherein extracting the grammatical features from the given training data includes: extracting tense from sentences included in the training data; extracting mood from the sentences; extracting aspect from the sentences; extracting modality from the sentences; and extracting experiencers from the sentences.
4. The method of claim 2 , wherein extracting the grammatical features from the given training data includes: extracting tense from sentences included in the training data; extracting mood from the sentences; extracting aspect from the sentences; extracting modality from the sentences; and extracting experiencers from the sentences. 5. The method of claim 4 , wherein extracting the tense includes extracting the tense by part-of-speech (POS) tagging.