1. (+) Your mother prepared dinner.

    (-) Your mother didn't prepare dinner.

2. (+) The cleaner finished cleaning.

    (-) The cleaner didn't finish cleaning.

Thì Quá khứ đơn với động từ thường:

 (+): S + Ved/V2 + O.

 (-): S + did not + Vo + O

 (?): Did + S + Vo + O?

Thì Quá khứ đơn với động từ tobe:
 (+): S + was/were + O

 (-): S + was/were not + O

 (?): Was/Were + S + O?

1 Did your mother prepare the dinner ? 

+) my mother prepared the dinner

Cấu trúc :  S + Ved/V2 + O.

 -)  my mother didn't prepare the dinner

Cấu trúc : No, S + didn’t+Vo+O

2 Did the cleaner finish cleaning
(+)   the cleaner finished cleaning.

Cấu trúc :  S + Ved/V2 + O.
 (-) the cleaner didn't finish cleaning

Cấu trúc : S + didn't + Vo + O

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