do you think 都是插入语吗Who is singing?Who do you think is singing?（被插入的疑问句原来就是陈述语序,不需要做调整）的－－有人这样说,请问Who is singing?既然是特殊疑问句,为什么它不像其他疑问句

do you think 都是插入语吗
Who is singing?
Who do you think is singing?（被插入的疑问句原来就是陈述语序,不需要做调整）的－－有人这样说,请问Who is singing?既然是特殊疑问句,为什么它不像其他疑问句是疑问语序而是陈述语序,

1.是插入语
2.特殊疑问句以疑问词开头,如疑问词是句子主语不须改变语序.