Classic Lamp<br>Tom was over at his girlfriend's house. Her parent's had a lot of antiques. Tom accidentally dropped a lamp. It was worth thousands of dollars. Tom spent a long time paying them back for it.
The lamp had to be replaced.
We don't know if it had to be replaced.
( z0 obligate :ARG2 ( z1 replace :ARG1 ( z2 lamp ) ) )
(z0 / obligate-01
    :ARG2 (z1 / replace-01
              :ARG1 (z2 / lamp)))
The lamp had to be replaced .
z0 :ARG2 z1
z1 :ARG1 z2