i wonder how much it costs还是how much does it cost对

i wonder how much it costs还是how much does it cost对
i wonder how much it costs:i wonder how much does it cost
哪个对 为什么` 所有定语丛句都遵循主谓语序吗?
为什么我原来做过一个题答案是
i wonder what's the matter with him
而不是
i wonder what the matter with him is