  This paper describes our system submitted to task 4 of SemEval 2020:
Commonsense Validation and Explanation (ComVE) which consists of three
sub-tasks. The task is to directly validate the given sentence whether or not
it makes sense and require the model to explain it. Based on BERTarchitecture
with a multi-task setting, we propose an effective and interpretable "Explain,
Reason and Predict" (ERP) system to solve the three sub-tasks about
commonsense: (a) Validation, (b)Reasoning, and (c) Explanation. Inspired by
cognitive studies of common sense, our system first generates a reason or
understanding of the sentences and then chooses which one statement makes
sense, which is achieved by multi-task learning. During the post-evaluation,
our system has reached 92.9% accuracy in subtask A (rank 11), 89.7% accuracy in
subtask B (rank 9), andBLEU score of 12.9 in subtask C (rank 8)
