Câu 19 : A.were doing 

-> Sửa lại : had done 

-> S + had + Vpp +before + S +Ved/cột 2 

Câu 20 : A.wrote 

-> As +  S+ was/were + V-ing , S+ Ved/cột 2 + ........

Câu 21 : I last visited my parents seven months ago . 

-> S+ last +Ved/cột 2 + ......... + time ( quá khứ )

Câu 22 : John asked Mary if she had gone camping with her friends the previous Sunday. 

-> Câu tường thuật dạng Yes or No questions 

-> S + asked + (O) + if/whether + S + V lùi thì 

-> QKĐ => QKHT , last Sunday  => the previous Sunday 

Câu 23 : My father told me not to go out so late at night  

-> S+told/tell + sb + Aux + to V + ...... 

-> Cha tôi đã nói với tôi rằng đừng đi ra ngoài quá muộn .

Câu 24 : My mother advised that drinking coffee is very harmful to health . 

-> Advised +that + V-ing + .......... 

@Chae

Câu 19 : A.were doing 

-> Sửa lại : had done 

Câu 20 : A.wrote 

->Sửa lại : was writing 

Câu 21 : I last visited my parents seven months ago . 

-> S+ last +V(QKĐ) + ......... 

Câu 22 : John asked Mary if she had gone camping with her friends the previous Sunday. 

-> S + asked + (O) + if/whether + S + V lùi thì 

Câu 23 : My father told me not to go out so late at night  

-> S+told/tell + sb + trợ động từ + to V + ...... 

Câu 24 : My mother advised that drinking coffee is very harmful to health . 

@Blinklovebp