`_` He went to Ha Noi last week

`(-)` He didn’t go to Ha Noi last week.

`(?)` Did he go to Ha Noi last week?

`_` They were students 10 years ago

`(-)` They weren’t students 10 years ago.

`(?)` Were they students 10 years ago?

____________________________________________________________

`@` Qúa Khứ Đơn:

`***` Dạng tobe:

`+)` S + was/ were +…

`-)` S + was/ were + not

`?)` Was/ Were + S +…?

`_`  Yes, S + was/ were.

`_` No, S + was/ were + not

`***` Dạng V (thường)

`+)` S + V(ed/ cột 2) + .....

`-)` S + did not + V (nguyên thể) + ....

`?)` Did + S + V(nguyên thể) +…

`_` Yes, S + did.

`_` No, S + didn't.