Tree<br>There was a tree we thought was dead. We tried getting estimates but it was expensive. But a big storm then rolled through. The high winds brought down the tree. Fortunately it didn't damage anything.
The tree may not have been dead.
The paragraph says they thought the tree was dead. Therefore it may have been alive. The system did not understand this.
( z1 possible :ARG1 ( z2 die :polarity - :ARG1 ( z3 tree ) ) )