`-` Thì QKTD :

`+` KĐ : S + was / were + V-ing

`+` PĐ : S + wasn't / weren't + V-ing

`=>` `DHNB` : at this time yesterday , this time yesterday , ...

`=>` Dùng để diễn tả về hành động đang xảy ra trong Quá khứ

`2`.The bird was flying . She was hiding

`3`.The leopard was eating . He wasn't waiting

`4`.The baby birds were sleeping . They weren't singing

`5`.The tiger was hiding . He wasn't dancing

`\text{# TF}`

`-` Câu hỏi chia thì QKTD `=>` Câu trả lời cũng chia thì QKTD

`-` Câu khẳng định ( thì QKTD): S+ was/ were+ Ving

`-` Câu phủ định ( thì QKTD): S+ was/ were+ not+ Ving

`2`. The bird was flying. She wasn't hiding 

`-` Theo hình, ta thấy có `1` chú chim đang bay

`3`. The leopard wasn't eating. He was waiting

`-` Theo hình, ta thấy có `1` chú báo đang chờ đợi thứ gì đó sau bụi cây

`4`. The baby birds weren't sleeping. They were singing

`-` Theo hình, ta thấy có `3` chú chim con đang hót trong cái tổ ở trên cây

`5`. The tiger was hiding. He wasn't dacing.

`-` Theo hình, ta thấy có `1` con hổ đang trốn sau bụi cây