$1.$ I didn't walk the dog last night

$2$. Fred and I didn't go fishing last Saturday

$3$.She didn't tidy her room yesterday afternoon 

$4$. I didn't ride a scooter yesterday 

$5$. They didn't read the latest Harry Potter book 

Áp dụng công thức:

*Cấu trúc phủ định của thì quá khứ đơn:

→ S + didn't + V_inf

→ S + wasn't/ weren't + ...

`1.` I didn't walk the dog last night

`2.` Fred and me didn't go fishing last Saturday

`3.` She didn't tidy her room yesterday afternoon 

`4.` I didn't ride a scooter yesterday 

`5.` They didn't read the latest Harry Potter book 

*Cấu trúc phủ định của thì quá khứ đơn:

`→` S + didn't + V_inf

`→` S + wasn't/ weren't + ...