He bought [a blue] shirt yesterday(对划线部分提问)

问题描述:

He bought [a blue] shirt yesterday(对划线部分提问)

What color shirt did he buy yesterday?

what color of shirt he had bought yesterday?

What kind of shirt did he buy yesterday ?

which shirt did he buy yesterday?

What shirt did he buy yesterday?
a blue是定语,修饰shirt,所以提问时what后面也要紧跟shirt.