I want to konw who is you best friend错了；因为作为主句的宾语从句,要用陈述句的语序；后者正确
I want to konw what your name is正确Could you tell me-------------?A.how old is your sonB.that he will come here soonC.whether is it fine tomorrowD.who is going to speak at the meeting那这题又如何解释？D因为在这一句中，疑问代词who正巧处于主语的位置上，这是一个陈述句语序的宾语从句，正确；而其余几个都不是陈述句语序的意思是tell 和 me 之间省略了（that）?那如果改为who the man with long hair is对吗？是的tell 和 me 之间省略了（that）改为who the man with long hair is对