6. Nga said that she would post that letter. ( tương lai đơn lùi thì: will=> would)

7. Mr. John said that he had to leave then. (must=> had to, right now/now=> then)

8. Mai told Nam not to go to the cinema with him. ( công thức: asked/told SB to (not to) do ST)

9. The teacher asked me if I was so late today. ( công thức: S+asked +IF/WHETHER), (hiện tại đơn=> quá khứ đơn )

10. Nam asked me if I liked chicken. ( giống câu trên)

$6)$  Nga said that she would post that letter.

Câu tường thuật `:`

`->` S `+` said `+` ( that ) `+` S `+` V `+` O.

Lùi thì `:`

`+` Tương lai đơn `->` Tương lai quá khứ `:` S `+` would `+` V_inf `+` O.

`+` I `->` She

$7)$  Mr. John said that he had to leave then.

Câu tường thuật `:`

`->` S `+` said `+` ( that ) `+` S `+` V `+` O.

Lùi thì `:`

`+` Must `->` Had to

`+` I `->` He

$8)$  Mai told Nam not to go to the cinema with him.

Câu tường thuật `:`

`->` S `+` told sb `+` ( not ) `+` to `+` V_inf `+` O.

Lùi thì `:`

`+` You `->` Him

$9)$  The teacher asked me if I was so late today.

Câu tường thuật `:`

`->` S `+` asked sb `+` if / whether `+` S `+` V `+` O.

Lùi thì `:`

`+` HTĐ `->` QKĐ

$10)$  Nam asked me if I liked chicken.

Câu tường thuật `:`

`->` S `+` asked sb `+` if / whether `+` S `+` V `+` O.

Lùi thì `:`

`+` HTĐ `->` QKĐ