1. What is the price of these shoes? --> How.... --> How.... 2. How much did the blue shirt cost --> How.... --> What.... 3. How much do these shoes cost? --> What.... --> How....

`1.` How much are these shoes`?`

`=` How much do these shoes cost`?`

`2.` How much was the blue shirt`?`

`=` What was the price of the blue shirt`?`

`3.` What is the price of these shoes`?`  

`=` How much are these shoes`?`

`-----------------`

`-` Cấu trúc câu hỏi về giá cả:

`-` What is the price of `+` S `?`

`=` How much `+` tobe `+` S `?`

`=` How much `+` do/does `+` S `+` cost`?`