` 1) ` The boy said to his sister ( that ) he would help her check her car then 

` - ` Will ` -> ` Would 

` - ` Now ` -> ` Then 

` - ` Đại từ nhân xưng I ` -> ` he 

` 2) ` . The woman said ( that ) she was so tired 

` - `  Đại từ nhân xưng I `  -> `  She 

` - `  Hiện tại đơn `  -> `  Qúa khứ đơn 

` 3) `  . The police said to Mr Ba ( that ) he could not park there 

` - `  Đại từ nhân xưng you `  -> `  He 

` - `  Can `  -> `  Could 

` - `  Here `  -> `  There 

` + `  Câu tường thuật : S + said ( to sb ) + ( that ) + S + V ( lùi thì )

`1.` The boy said to his sister that he would help her check her car then.

`2.` The woman said to me that she was so tired.

`3.` The police said to Mr. Ba that he couldn't park there.

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`\text{Giải thích:}`

`+)` Trần thuật gián tiếp: S + said (+O) (that) + S2 đổi ngôi + V lùi thì.

`+)` I → he/she (theo chủ ngữ)

`+)` you → he/she (theo chủ ngữ)

`+)` you → his/her (theo tân ngữ)

`+)` will → would

`+)` now → then

`+)` your → her/his

`+)` am/is/are → was/were

`+)` can't → couldn't 

`+)` here → there