`11.` Thu asked Long if Lan's mother worked for a bank

`12.` Phong asked Tuan if the students knew something about their new English teacher

`13.` Thu asked Ba if Phong's father worked in a hospital

`14.` Phong asked Lam if their teacher asked them to clean up the room

`15.` She asked me if I could speak Chinese

`16.` Tam asked Thu if she would be there for five days

`17.` Lan asked her teacher weather to keep their room warm

`18.` She asked her husband if they needed some help

`19.` Lan asked Hoa if she might have a look at your pictures

`20.` Phong asked Ba if those athletes could swim across the river

`21.` Lam asked Lan if their class would take part in that competition

`22.` My mother asked my brother if he could buy her some soap on the way home

`23.` Lan asked Thu if she saw somebody using her book

`24.` Phong asked his teacher if the students in grade 9 would have their final exam in May

`25.` Mai asked Hoa if she might use her dictionary for a moment

*Yes - No question: S + asked + (O) + if/ whether + S + V

*Lùi thì:

HTĐ → QKĐ

will → would

can → could