Noun Clause using as an object can be transformed into passive voice by these methods:
Active -Sub+V(tell/believe/consider) that s+v+o.
RP. 1-It +be+v3+that clause .
RP 2- S of that clause+be v3+ to v1/to have v3.
RP. 3- That clause + be+ v3+by +sub .asobj. of PC.