`17.` She asked how long I had worked for that company

`-` lùi thì: HTHT `->` QKHT
`-` this `->` that

`18.` She asked why he had been working so hard

`-` lùi thì: HTHTTD `->` QKHTTD

`19.` She asked me why I had done it when she had told me not to

`-`lùi thì: QKĐ `->` QKHT
`20.` She asked me why I had not come at ten o'clock

`-` lùi thì: QKĐ `->` QKHT

`21.` Helen asked the children if they were going to visit their uncle the following day

`-` am/is/are going to `->` was/were going to

`-` tomorrow `->` the following day/ the next day

`__________________________`

`***` Câu gián tiếp:

`@` Dạng Yes/No question:

S + asked/wondered/wanted to know+ (O) + If/Whether + S + V(lùi thì)

`@` Dạng Wh_question:

S + asked/wondered/wanted to know + (O) + Wh_ + S + V(lùi thì)

`\text{17,}` She asked me how long I had worked for that company

 `\text{- Lùi thì : }` HTHT → QKHT

`\text{- Đổi 1 số cụm từ :}` this → that

`\text{- Đổi ngôi :}` you → I

`\text{18,}`She asked me why he had been working so hard

`\text{- Lùi thì :}` HTHTTD → QKHTTD

`\text{- Đổi ngôi :}` he vẫn giữ nguyên

`\text{19,}`She asked me why I had done it when she had told me not to.

$\text{- Lùi thì :}$ QKĐ → QKHT

$\text{- Đổi ngôi :}$ you → I , I → she

$\text{20,}$ She asked me why I hadn't come at ten o'clock

$\text{- Lùi thì :}$ QKĐ → QKHT

$\text{- Đổi ngôi :}$ you → I

$\text{21,}$ Helen asked the child if he was going to visit his uncle the next day

`\text{- Lùi thì : }` HTTD → QKTD

`\text{- Đổi ngôi :}` the child → he

`\text{- Đổi 1 số cụm từ :}` tomorrow → the next day

----------------------------------------------------------

`\text{Câu tường thuật:}`

`\text{Wh-qs : A + asked B + Wh/How + S ( đổi ngôi) + V (lùi thì)}`

`\text{Yes/No qs : A asked B + if/whether + S (đổi ngôi ) + V (lùi thì )}`