`@` Bạn tham khảo

Đáp án:

Were you a teacher two years ago? Yes, I was.

`->` Thì quá khứ đơn:

(?) Was/were + S + (a/an) + adj/n + O? - Yes, S + was/were

                                                                - No, S + was/were + not

`**` Chủ ngữ you `=>` Dùng were

`**` Chủ ngữ I `=>` Dùng was

Cấu trúc thì quá khứ đơn ( với tobe ) :

` ( + ) ` : S + was / were + ... 
` ( - ) ` : S + wasn't / weren't + ... 
` ( ? ) ` : Was / Were + S + ... 
` - ` Was not ` = ` Wasn't , Were not ` = ` Weren't 
` + ` I / he / she / it / chủ ngữ số ít + was ( not ) + ... 
` + ` You / we / they / chủ ngữ số nhiều + were ( not ) + ...

` 3 `  . Were - Was 

` - `  Chủ ngữ là You ` -> `  dùng be là were 

` - `  Chủ ngữ là I `  -> `  dùng be là was