know someone in the world is waiting for me, although I've no idea of who he is.少了什么
问题描述：
know someone in the world is waiting for me, although I've no idea of who he is.
少了什么
答
主语
答
少主语了啊。。
谁知道这世界上有人在等我呢。。。
所以是主语了。。。
答
我知道世界上有个人在等待我,尽管我并不知道他是谁
答
缺少一个主语。
全句应为：
I know someone in the world is waiting for me, although I've no idea of who he is.