Tom isn't happy because he failed the math test.（划线提问）划：because he failed math test
问题描述：
Tom isn't happy because he failed the math test.（划线提问）划：because he failed math test
答
对原因提问用why
Why isn't Tom happy?Tom为什么不开心?Why Tom isn't happy不行么？你说的这句是陈述语序，对划线部分提问要的是疑问语序，是个问句