My mom taught me how to play when I was seven years old.

问题描述:

My mom taught me how to play when I was seven years old.
这句话中的how to play 是不是缺少了个宾语?要不要加it?
这句话是课本上的,不是说How to do 要加个宾语才是对的吗?

这句话是对的,teacher sb how to do sth,教某人如何做某事,how to play 可以作为单独成分,这里是动词不定式做后置定语,可以单独使用,不用接任何成分.