Singing songs makes me more interested in learning English.唱歌使我对学英语更感兴趣.
Singing songs是动名词短语作主语,这是把唱歌当作一件事情来描述.对它划线提问只能用what替换它.因为what是作主语,所以不用改变语序.改动后的句子如下：
What makes you more interested in learning Englishi?是什么使你对学英语更感兴趣?
希望这个回答能帮到你.顺祝周末愉快!