5So, according to this rule, the only way of passivising the sentence like:
The teacher explained a new rule to his students.
A new rule was explained to the students (by the teacher). .....YES
However, to my ear the sentence The students were explained a new rule doesn't sound that bad. .....Well, it is.
Nor does the sentence: We were suggested a new idea. (though I'm not dead sure with this one). ....That's bad too.
A new idea was suggested TO us.
A new idea was suggested FOR us? Possible, but less likely.
Student or Learner