英语高手帮我看看下列句子是什么从句
是什么从句,而且引导词作什么语,1What I want to know is why you refused me.2.Lily wanted to know why her grandma liked the handbag.3.Did you understand what she said?4 Are you still thinking about yesterday's game?Oh,that's what makes me feel excited.5There is not much different between the two.I really dont't know which I should choose.6.NO one knows which gate we hace to go to