As the number of learners of English is con- stantly growing, automatic error correction of ESL learners? writing is an increasingly ac- tive area of research. However, most research has mainly focused on errors concerning arti- cles and prepositions even though tense/aspect errors are also important. One of the main reasons why tense/aspect error correction is difficult is that the choice of tense/aspect is highly dependent on global context. Previous research on grammatical error correction typ- ically uses pointwise prediction that performs classification on each word independently, and thus fails to capture the information of neigh- boring labels. In order to take global infor- mation into account, we regard the task as se- quence labeling: each verb phrase in a doc- ument is labeled w...

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