$III.$ ...
$1.$ spoken
- S + tobe + V (Pii) + (by O).
$2.$ am not
- S + tobe + (not) + allowed + to V.
$3.$ watered
- S + tobe + V (Pii) + (by O).
$4.$ is
- S + tobe + V (Pii) + (by O).
$5.$ is prepared
- S + tobe + V (Pii) + (by O).
$6.$ buys
- S + V (s/es).
$7.$ admired
- S + tobe + V (Pii) + (by O).
$8.$ are done
- S + tobe + V (Pii) + (by O).
$9.$ is polluted
- S + tobe + V (Pii) + (by O).
$10.$ broken
- S + tobe + V (Pii) + (by O).
$11.$ are planted
- S + tobe + V (Pii) + (by O).
$12.$ is typed
- S + tobe + V (Pii) + (by O).
$13.$ is studied
$14.$ is made
$15.$ by
- S + tobe + V (Pii) + (by O).