Task: Pos Tagging
Input (English): Sentence: While the Indian army has become rock - solid in the western front , and has developed the capability of withstanding any Pakistani adventure in that sector , it has {{ become }} highly vulnerable in its eastern sector , where its enemy is not a national army but a multitude of secessionist , terrorist and drug - running militants operating between Southeast Asia and northeastern India through Bangladesh . 
Word: become
Output (English): VBN