你上面讲那个句子是正确的
其实同位语从句和定语从句有点相似,就是从句中不缺成分的话就用that,缺成分的话就要用相应的连接词了,比如用what引导的同位语从句,eg.i have no idea what he is doing now.在这句话里what在从句中充当宾语,而从句不缺成分的话就要用that,eg.we made a decision that we shouldn't go there.也有用whether引导的,eg.i have no idea whether i should go there.也有用how的情况,eg.it is a question how he didi it.还有用who的,eg.i have no idea who she is.总之缺什么就补什么,不知道你懂了没