Answer:
I informed my teacher that I had been absent the day before.
Step-by-step explanation:
In indirect speech, you report what was said WITHOUT using the exact words.
1. Change the reporting verb "said" to "told"
This indicates that the statement was communicated to someone.
2. Introduce a reporting clause
This specifies WHO made the statement (in this case, "my teacher").
3. Change the pronouns and verb tense
This reflects the shift from first person to third person and past tense.
"I said to my teacher, 'I was absent yesterday.'"
Then turns into:
I told my teacher that I had been absent the day before.
The sentence is therefore changed from direct to indirect speech while STILL providing the same information.