Problem: Draw tree structures for each of the following sentences and then provide a lexical entry for the italicized passive verb:
a. Peter has been asked to resign.
b. I assume the matter to have been filed in the appropriate records.
c. Smith wants the picture to be removed from the office.
d. The events have been described well.
e. Over 120 different contaminants have been dumped into the river.
f. Heart disease is considered the leading cause of death in the United States.
g. The balloon is positioned in an area of blockage and is inflated.
h. There was believed to have been a riot in the kitchen.
i. Cancer is now thought to be unlikely to be caused by hot dogs.