原句中的does是实义动词翻译成汉语是“做”的意思.
改成一般疑问句应在主语“your sister "前加上助动词do/does来帮助构成一般疑问句.
因为“your sister "是第三人称单数形式,所以助动词应选用“does”
单三形式已在助动词“does”上体现出来了,所以原句中的实义动词“does”要变回原型“do”（也可理解为助动词后加动词原形）
所以改成的一般疑问句为：Does your sister do her homework at 7o'clock?
把 Your sister does her homework at 7o'clock.改成一般疑问句.
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