My mother looks beautiful是一个陈述句，我们先来观察这个陈述句时态。句子的主语用了第三人称单数my mother。句子的谓语用了动词look的单三looks。因此我们可以判断，这个句子是一般现在时，所以在变一般疑问句时，要加助动词does，然后把第一人称my变成第二人称Your并且把logs还原成look。Does your mother look beautiful?Yes, she does, no, she doesn't.
my mother looks beautiful改一般疑问句 扩展
does your mother look beautiful?这类实义动词作谓语动词的句子变一般疑问句要借助动词do（谓语是原形）does （谓语是单三）did（谓语是过去式），放在主语前，后面的动词一定要变回原形。例如：1，he bought a pen last year.变一般疑问句为：did he buy a pen last year?
2，they study very hard.
do they study very hard?他们学习非常努力吗？
