`47.` My sister spent her holiday in Paris

`48.` She went by a boat trip on the river but it was cold and windy

`49.`  She saw amazing sights but she lost her camera

`50.`  She didn't enjoy the trip

`->` Cấu trúc thì Quá khứ đơn với động từ thường

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

`( - )`: S + didn't + V-inf + O

`( ? )`: Did + S + V-inf + O?

`->` Cấu trúc thì Quá khứ đơn với động từ tobe

`( + )`: S + was/ were + N/ Adj

`( - )`: S + was/ were not + N/ Adj

`( ? )`: Was/ Were + S + N/ Adj?

`=>` He, she, it, I là chủ từ số ít `->` Dùng was

`=>` We, you, they là chủ từ số nhiều `->` Dùng were