Task: Pos Tagging
Input (English): When was the aircraft first flown that was intended to operate from I-400 class submarines whose original mission was to conduct aerial attacks against the United States ?
Output (English): WRB VBD DT NN RB VBN DT VBD VBN TO VB IN NNP NN NNS WP$ JJ NN VBD TO VB JJ NNS IN DT NNP NNPS .