`nacutihe.vt`
`7.` Minh said that he wanted to become a member of our school IT club.

`-` I `->` he (đổi đại từ)
`-` want `->` wanted (đổi thì : HTĐ `->` QKĐ)

`-` want to + V_inf

`8.` Lan said that her brother would use an app on her smartphone to practise speaking regularly.

`-` will `->` would 

`-` my `->` her

`9.` The salesman told us that his robot was cleaning the house and cooking at the same time.

`-` my `->` his
`-` is cleaning `->` was cleaning (đổi thì : HTTD `->` QKTD)

`10.` Hoa wanted to know what they were talking about.

`-` Đổi thì : HTTD `->` QKTD

`11.` Bella said she had just sent letter to Hoa.

`-` I `->` she (đổi đại từ)

`-` Đổi thì : HTHT `->` QKHT
`12.` Minh asked me what I was going to buy for a picnic.

`-` you `->` I (đổi đại từ)
`-` am/is/are going to `->` were/was going to

`13.` David said that robots could never replace human beings.
`-` can `->` could
`14.` Alex asked if i liked listening to music.

`-` Đổi thì HTĐ `->` QKĐ
`15.` My brother asked me which bike I liked best.

`-` Đổi thì : HTĐ `->` QKĐ
`16.` Jenny asked her sister why she didn't help Jack.

`-` you `->` she 
`-` Đổi thì : HTĐ `->` QKĐ
`17.` Nhung asked the ideal place to go camping was.

`-` Đổi thì : HTĐ `->` QKĐ
`18.` Hoa said that she would call me the following day.

`-` I `->` she (đổi đại từ)
`-` will `->` would
`-` tomorrow `->` the next day/ the following day.
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*Câu tường thuật :
`+` Gián tiếp tường thuật : S + said/told (sb) + (that) + S + V (lùi thì)
`+` Dạng câu nghi vấn (Wh-questions) : S + asked (+ O)/ wanted to know + Wh-words + S + V (lùi thì)
`+` Dạng câu nghi vấn (Yes/No questions) : S + asked/wanted to know + if/whether + S + V (lùi thì)