这是宾语从句。从句语序错了，应该要和陈述句语序一样才对,而且主句是一般过去时，所以从句也要一般过去时啊。改正如下:I asked him who that boy was in the playground.而且在特指那个男孩的情况下，一般用定冠词the,所以这个句子这样会更好I asked him who the boy was in the playground.不知是否对，不过，可以肯定的是，从句中缺少了成分。如果你用who作引导词的话，然后后面还要跟in the playground,应该要有定语从句出现了。I asked him who was the boy that (doing someting 或加 is) in the playground. 这是我的看法，不知是否对啊。请见谅。
hehe, pretty cute.If I were you, I might add quotation mark, such as:I asked him "who is that boy in the playgound"?Therefore, whatsoever, there is a mistake in you original sentence.Hopefully it helps.-Nap.
