$\text{1.}$ You have heard about that, haven't you?

$\text{2.}$ Nam did the work well, didn't he?

$\text{3.}$ He didn’t have to speak to me, did he?

$\text{4.}$ He won't fall down, will he?

$\text{5.}$ You would like the window open, would you?

S + V + O, trợ động từ + đại từ chủ ngữ của S?

$\text{1.}$ haven't you 

$\text{2.}$ didn't he 

$\text{3.}$ did he

$\text{4.}$ will he

$\text{5.}$ would you 

→  Câu hỏi láy đuôi : S + V + .... , Aux + S ? 

→ Aux : trợ động từ 

→ Trợ động từ : has/have ( HTHT ) , did/was/were ( QKĐ ) , do/does/is/am/are ( HTĐ ) , is/am/are ( HTTD ) , would ( Aux của would ) , ...