Question

convert the sentences in the active voice to passive and vice versa. 1. the moral of the story has to be understood by the teacher

Answer 1

Rules for changing Active Voice into Passive Voice:

• Identify the subject, the verb and the object: SVO.
• Change the object into subject.
• Put the suitable helping verb or auxiliary verb. ...
• Change the verb into past participle of the verb.
• Add the preposition "by"
• Change the subject into object.

Answer 2

The teacher  has understood  the moral of the story.