They went to Europe on their last summer holiday 

Chuyển sang câu hỏi 

`=>` Did they go to Europe on their last summer holiday?

`-` CT thì QKĐ:

`(+)`: S + Ved/c2

`(-)` S + didn't + V-inf

`(?)` (WH-) + did + S + V-inf?

`-` Vì trong câu hỏi dùng V-inf nên chuyển 'went' thành 'go'

$\color{#88DCFF}{\text{#Byen.}}$

`->` Did they go to Europe on their last summer holiday?

`-` CT :

Khẳng định : S + V2/V-ed

Phủ định : S + didn't + V-inf

Câu hỏi yes/no : Did + S + V-inf?

Câu hỏi với wh- : wh-questions + did + S + V-inf?