Rule: An extraposed non-finite clause requires an active verb.
Examples of errors:
(1) It must be tried to find him.
(2) It was suggested to go ahead with the project.
It was
suggested
planned
intended
*to go ahead with the project
that we/he, etc. should) go ahead with the project
Most verbs do not allow extraposition of an infinitive subject in the passive, although an extraposed finite clause is acceptable, e.g.:
Decide is an exception to this rule:
It was decided to go ahead with the project