`1.` My father didn't decorate the Christmas tree

`2.` Lan didn't buy a new dress yesterday 

`3.` They weren't late for school 

`4.` Mr. Ba didn't take his children to the zoo last Sunday 

`5.` Mai didn't make a mistake in her exam 

`==========`

`@` Cấu trúc thì Quá Khứ Đơn:

`+` Động từ thường:

`(+)` S + V2/ed + O

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

`(?)` Did + S + V..?

`+` Động từ tobe:

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

`(-)` S + was/ were + not + O

`(?)` Was/ were + S + O..?

`-` I/ He/ She/ It/ N số ít + was

`-` We/ You/ They/ N số nhiều + were

`->` Dấu hiệu nhận biết: yesterday, last, ago, in,....

`-` Thì QKĐ ( PĐ ) :

`+` ĐT Tobe : S + wasn't / weren't + adj / n

`+` ĐT Thường : S + didn't + V

`=>` `DHNB` : ago , last , yesterday , in + Mốc thời gian trong Quá khứ , ...

`*` I , He , She , It `+` was ( not )

`*` You , We , They `+` were ( not )

`1`.My father didn't decorate the Christmas tree

`2`.Lan didn't buy a new dress yesterday

`3`.They weren't late for school

`4`.Mr.Ba didn't take his children to the zoo last Sunday

`5`.Mai didn't make a mistake in her exam

`\text{# TF}`