sentence: Before I started university , I had n't a lot of friends and I was so lonely , but after I started to study at Ton Duc Thang university , I became more happy , comfortable and sociable .
modified: Before I entered university , life in high school had n't a lot of friends and I was so lonely but after I started to study at Ton Duc Thang university , I became more happy , comfortable and interactive .
transformation: VERB, OTHER, PUNCT, ADJ