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Giải Thích :

`Q`úa Khứ Đơn `-` Động từ thường :

(`+`) S + Ved + O.

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

( `?` )  Did + S + V?

`Q`úa Khứ Đơn `-` Động từ tobe :

(`+`) S + were/was + O.

(`-`) S + weren't/wasn't + O.

( `?` )  Were/was + S + O?

`+` She/he/it/I + Was/wasn't. 

`+` We/you/they + Were/weren't. 

Đáp án:

1. I wrote an essay in math class  this morning.

$\Rightarrow$ I didn't write an essay in math class  this morning.

$\Rightarrow$ Did I write an essay in math class  this morning?

2. She watched TV yesterday morning.

$\Rightarrow$ She didn't watch TV yesterday morning.

$\Rightarrow$ Did she watch TV yesterday morning?

3. He and you were in the English club last Monday.

$\Rightarrow$ He and you didn't be in the English club last Monday.

$\Rightarrow$ Did he and you be in the English club last Monday?

4. They ate noodles an hour ago.

$\Rightarrow$ They didn't eat noodles an hour ago.

$\Rightarrow$ Did they eat noodles an hour ago?

5. We always had a nice time on the Christmas holiday in the past.

$\Rightarrow$ We didn't always have a nice time on the Christmas holiday in the past.

$\Rightarrow$ Did we always have a nice time on the Christmas holiday in the past?

6. My mom decorated the Christmas tree.

$\Rightarrow$ My mom didn't decorate the Christmas tree.

$\Rightarrow$ Did my mom decorate the Christmas tree?

Giải thích:

$\text{(+) S + Ved/2 + O}$

$\text{(-) S + did not/ didn't + V + O}$

$\text{(?) Did + S + V + O?}$

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