a, She said (that) she was going to visit Korea the following month.
(Lùi thì: am going to --> was going to, next --> the following)
b, → Hoa said to me (that) he had picked her up the day before.
( Lùi thì: picked (QKĐ) --> had picked (QKHT), yesterday --> the day before)
c, The teacher asked me if/whether I loved English.
(Công thức: S + asked (sb) + if/whether+ S + V (V lùi thì). )
d, They asked me if/whether I had done my homework yet.
(Công thức: như câu c.)