$$1)$$ Mr Khoa said to me that I studied English quite well in that class
=> Thay đổi về ngôi: You -> I/We/they
=> Thay đổi về trạng từ: This -> That
-> S + say(s)/said/told + (that) + S + V
$$2)$$ Ba said to Lan that his father took him to school
=> Thay đổi về ngôi: Me -> Him/Her, My -> His/Her
-> S + say(s)/said/told + (that) + S + V
$$3)$$ Huong said to her grandpa that she liked all his stories
=>Thay đổi về ngôi: I -> He/She
-> S + say(s)/said/told + (that) + S + V
$$4)$$ Thuy said to her uncle that his son spoke English quite fluently in her class
=> Thay đổi về ngôi: My -> His/Her
-> S + say(s)/said/told + (that) + S + V
$$5)$$ Huy said to Lien that he did his homework after school
=> Thay đổi về ngôi: I -> He/She, My -> His/Her
-> S + say(s)/said/told + (that) + S + V
$$6)$$ Nam said to Hoa that his sister didn't play sports in her free time
=> Thay đổi về ngôi: My -> His/Her
-> S + say(s)/said/told + (that) + S + V