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4. He said, “I can` t move the piano alone.”
5. She said, “Dairy products are useful for little children.”
6. The teacher said, “I will travel around Europe next month”
7. She said, “Doctors don`t advise us to eat chips and chocolate.”
8. The girl said, “All the guys try to look really cool driving up and down in their dad`s car.”
9. He said, “I am going to buy a new car.”
10. My mum told, «I didn,t work at school last year».
11. “My friend lives in Moscow”, said Alec.
12. The poor man said, “ My horse is wild. It can kill your horse”.
13. “You have not done your work well”, said the teacher to me.
14. “I can’t explain this rule to you”’ said my classmate to me.
15. He said, ” I have just received a letter from my uncle”.
16. I said, ”I can give you my address”. ​

4. He said that he couldn't move the piano alone.
To convert the direct speech to indirect speech, we need to use the reporting verb "said" in the past tense, followed by the conjunction "that." The verb tense in the reported speech also needs to change from present to past.

5. She said that dairy products were useful for little children.
Again, we use the reporting verb "said" in the past tense and change the verb tense in the reported speech from present to past.

6. The teacher said that she would travel around Europe next month.
In this case, the reporting verb "said" should be changed to the past tense. The verb tense in the reported speech also needs to be changed from future to past.

7. She said that doctors didn't advise them to eat chips and chocolate.
The reporting verb "said" needs to be changed to the past tense, and the verb tense in the reported speech should be changed from present to past.

8. The girl said that all the guys tried to look really cool driving up and down in their dad's car.
Once again, the reporting verb "said" should be changed to the past tense, and the verb tense in the reported speech should be changed from present to past.

9. He said that he was going to buy a new car.
We change the reporting verb "said" to the past tense, and the verb tense in the reported speech changes from present continuous to past continuous.

10. My mum told me that she hadn't worked at school last year.
In this case, we change the reporting verb "told" to the past tense, and we need to use the conjunction "that." Additionally, the verb tense in the reported speech needs to change from present perfect to past perfect.

11. Alec said that his friend lived in Moscow.
We change the reporting verb "said" to the past tense, and the verb tense in the reported speech changes from present simple to past simple.

12. The poor man said that his horse was wild and could kill my horse.
Again, we change the reporting verb "said" to the past tense, and the verb tense in the reported speech changes from present simple to past simple.

13. The teacher said to me, "You have not done your work well."
To convert this sentence from direct speech to indirect speech, we need to use the reporting verb "said" in the past tense, followed by the preposition "to." The verb tense in the reported speech should remain the same.

14. My classmate said to me, "I can't explain this rule to you."
Similarly, we change the reporting verb "said" to the past tense, followed by the preposition "to." The verb tense in the reported speech remains the same.

15. He said that he had just received a letter from his uncle.
Here, we change the reporting verb "said" to the past tense, and the verb tense in the reported speech changes from present perfect to past perfect.

16. I said that I could give him my address.
Once again, we change the reporting verb "said" to the past tense, and the verb tense in the reported speech changes from present simple to past simple.

By converting the direct speech to indirect speech, we can maintain the meaning of the original sentences while adjusting the verb tense and the structure of the reported speech.