He said, "I clean my teeth twice a day."

Solution (By Examveda Team)

This question belongs to the topic of Reported Speech in the area of Voice. It specifically focuses on converting a simple present tense sentence into indirect speech when the reporting verb is in the past tense.

Reported Speech is used to report what someone has said without quoting their exact words. When changing from direct to indirect speech, we usually apply three key rules:
1. Change of pronouns
2. Change of verb tense (if the reporting verb is in the past)
3. Change of time expressions (if needed)

Original Sentence (Direct Speech): He said, "I clean my teeth twice a day."

Step-by-step Conversion:
The reporting verb is "said" — it's in the past tense.
The verb inside the quotes is "clean", which is in the simple present tense.
In reported speech, when the reporting verb is in the past tense, simple present generally changes to simple past. So "clean" becomes "cleaned".
The pronoun "I" changes to "he" to match the subject.
The time expression "twice a day" remains unchanged because it's a general habitual statement.

Correct transformation:
He said that he cleaned his teeth twice a day.

Correct Answer: Option A: He said that he cleaned his teeth twice a day.

Other Options:
Option B: He said that he cleans his teeth twice a day. — ❌ Incorrect. "Cleans" is still in the present tense, which should have been shifted to past ("cleaned").
Option C: He said that he used to clean his teeth twice a day. — ❌ Incorrect. "Used to" implies a past habit that no longer continues, which changes the meaning.
Option D: He said that he is used to cleaning his teeth twice a day. — ❌ Incorrect. "Is used to" means he is accustomed to it, which again alters the meaning.

Conclusion: The only grammatically and logically correct transformation is Option A