Scary Dream<br>Tom woke up in a cold sweat. He was shaking and scared. He realized he had just had a scary dream. Tom was too afraid to fall back asleep. Instead he stayed up all night.
He didn't know why he was shaking.
The statement says Tom realized he had a scary dream therefore he would know why he was shaking and scared. 
( z1 know :polarity - :ARG0 ( z2 he ) :ARG1 ( z3 thing :ARG0-of ( z4 cause :ARG1 ( z5 shake :ARG1 z2 ) ) ) )