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

自己認(rèn)為：

主句主語(yǔ)：some children

主句謂語(yǔ)：want

主句賓語(yǔ)：to challenge themselves

但是后面非謂語(yǔ)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(yǔ)中的句子成分。謝謝拉。