`1.` Jack said that he was not an engineer then

`2.` He said that his sister was keen on reading books about sciences

`3.` Hoa said that her mother had given her a new bike on her birthday

`4.` John said that he hadn't eaten any meal the day before

`5.` She said that they would take part in the club next week

`6.` The teacher said that all students had to wear uniforms at school

`7.` Tom said that he had worked in the factory since 2004

`8.` She said that Mary would learn Japanese in Japan next year

`9.` Hoa said that she had been picking flowers before she had gone home

`10.` Lan said that her mother had visited London for two years

*Statement:

S + said + (that) + S + V

S + said + to + O + (that) + S + V

S + told + O + (that) + S + V

*Lùi thì:

Quá khứ đơn → Quá khứ hoàn thành

Hiện tại đơn → Quá khứ đơn

Hiện tại hoàn thành → Quá khứ hoàn thành

Hiện tại tiếp diễn → Quá khứ tiếp diễn

Quá khứ tiếp diễn → Quá khứ hoàn thành tiếp diễn

Hiện tại hoàn thành tiếp diễn → Quá khứ hoàn thành tiếp diễn

will → would

can → could

may → might 

must → had to

shall → should

be going to → was/ were going to