Giải thích:

Câu gián tiếp dạng trần thuật:

`-` S `+` told/said `+` that `+` S `+` V(lùi thì)…

Câu gián tiếp dạng mệnh lệnh, yêu cầu:

`-` S + commended/requested/advised + sb + (not) to V0..

*Chú ý:

`-` Khi viết lại câu tường thật, nhớ bỏ dấu ngoặc kép.

`-` Nếu trong ngoặc là câu sự thật hiển nhiên thì không cần lùi thì. 

`-` Nếu ngoài ngoặc là said to thì chuyển thành told, said thì cữ giữ nguyên. 

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`11,` Charlie said  that I could come and stay with him if I was ever in London.

you -> I

can -> could

me -> him

you -> I

are -> was 

`12,` Charlie said that Tom had had an accident the week before but he hadn't been injured.

had -> had had (QKĐ -> QKHT) 

last week -> the week before 

wasn't -> hadn't been 

`13,` Charlie said he had seen Jack at a party a few months ago and he had seemed fine.

I -> he

saw -> had seen

seemed -> had seemed 

`14,` Tom said that New York was bigger than London. 

is -> was 

`15,` The doctor advised me to stay in bed for a few days.