`C`ấu trúc chủ yếu : Thì QKĐ ( ĐT Tobe ) :

`+` KĐ : S + was / were + adj / n

`+` PĐ : S + wasn't / weren't + adj / n

`+` NV : Was / Were + S + adj / n ?

`=>` `DHNB` : yesterday , ago , last , ...

`a )` Yesterday , I wasn't at the park

`b )` My dad wasn't happy yesterday

`c )` It wasn't sunny yesterday

`d )` It wasn't cloudy yesterday

`e )` I was sick last night

`f )` My sister was at the swimming pool yesterday

`g )` It was rainny last Sunday

`\text{# Kirigiri}`

a) Yesterday , I wasn't at the park

b) My dad wasn't happy yesterday

c) It wasn't sunny yesterday

d) It wasn't cloudy yesterday

e) I was sick last night

f) My sister was at the swimming pool yesterday

g) It was rainny last Sunday