Ram had been punished by the teacher as all boys said that he was making noise in class

**Passive Voice Transformation:**

Ram was punished by the teacher because it was said by all the boys that he had made noises in the class.

**Explanation:**

In order to transform the given sentence into the passive voice, we need to make the object of the active sentence (Ram) the subject of the passive sentence, and the subject of the active sentence (the teacher) becomes the object of the passive sentence. Additionally, we need to use the past participle form of the verb "punish" (punished) and rephrase the sentence to include the phrase "it was said by all the boys" to indicate who made the statement about Ram's actions.

Let's break down the transformation into separate steps:

1. Identify the subject and object of the active sentence:
- Subject: The teacher
- Object: Ram

2. Move the object (Ram) to the subject position and make it the subject of the passive sentence:
- Ram

3. Use the past participle form of the verb "punish" (punished):
- Ram was punished

4. Use the preposition "by" followed by the subject of the active sentence (the teacher) as the object of the passive sentence:
- Ram was punished by the teacher

5. Rephrase the sentence to include the phrase "it was said by all the boys":
- Ram was punished by the teacher because it was said by all the boys

By following these steps, we have successfully transformed the given sentence into the passive voice.