“Has he seemed happy to paly with her?”这句话对吗

原句应该为He has seemed (to be) happy to paly with her.此处to be 被省略。这句话是对的。再看几个句子，或许对你理解有帮助：
Be what you seem (to be). 要表里一致。
He seems (to be) quite happy. 他似乎十分快乐。
It seems to me that it will snow. 我看要下雪。
It seems as if it is going to rain. 看来要下雨了。
即seem后面为动词不定式+be动词时，to be可省略，而seem后面为动词不定式+vt(实意动词时)to 不可省略。

不对

play 拼写错误了.

除了这个问题本身没错了.关键是就算你翻译成中文,你不觉得别扭吗

不对。一开始就错了。
Was he looked happily to play with her?
有错请指出。