Some children want to challenge themselves by learning a language different from what their parents speak at home.

自己認為：

主句主語：some children

主句謂語：want

主句賓語：to challenge themselves

但是后面非謂語中from是跟在learn后面形成learn...from...還是跟在different from。為什么？順便幫忙分析下非謂語中的句子成分。謝謝拉。