7.The teacher said "We can collect old book for the poor students"

The teacher said they could collect old book for the poor students.

8.She said "She doesn't buy this book"

She said that he didn't buy that book.

9.The boys said "We have to try our best to win the match"

The boys said they had to try their best to win the match

10.Her classmate said "Lan is the most intelligent girl in our class"

Her classmate said Lan was the most intelligent girl in their class.

11.They told us "Our friends will get the award for their highest scores"

They told us  their friends would get the award for their highest scores

13.Phong said "I need to learn more vocabulary"

Phong said  he needed to learn more vocabulary.

14.His brother told him "You can use my computer today"

His brother told him he could use his computer that day.