$\textit{o.}$ Britain's mother asked him if he was planning to go to school by train.

`p.` Huy asked Mai if that was her pen.

`q.` Minh asked Lan if her parents were living there.

`r.` Nguyet asked Phu if he had done his homework the night before.

`s.` Mrs. Hoa asked An if she had met her aunt.

`t.` My friends asked me if my school had 12 classes.

`u.` She asked me if there were 39 students in that class.

=>
o. Britain's mother asked him if he was planning to go to school by train.
p. Huy asked Mai if that was her pen.
q. Minh asked Lan if her parents were living there.
r. Nguyet asked Phu if he had done his homework the day before.
s. Mrs Hoa asked An if she had met her aunt.
t. My friends asked me if my school had 12 classes.
u. She asked me if there were 39 students in that class.
Câu tường thuật dạng Yes/No questions : asked sb if S V(lùi thì)
Lùi thì trong câu tường thuật :
HTTD -> QKTD
HTĐ -> QKĐ
QKĐ -> QKHT
HTHT -> QKHT