"Its a serious thing. I froze, then I started to cry," she said. "It shocked me ... Neighbors are leaving items at a small memorial for the girls. 'It's just upsetting,' she said.
It wasn't a serious thing.
( z0 thing :ARG1-of ( z1 serious ) :polarity - )
(z0 / thing
    :ARG1-of (z1 / serious-02)
    :polarity -)
It was n't a serious thing .
z0 :ARG1-of z1
z0 :polarity 0