this/that作主语的一般疑问句

请教一下各位老师：类似像Is this your mother?/Is that your sister?如此的句子，回答是用Yes，it is.还是Yes，she is.啊？

Is this yourmother?/Is that your sister? 如此的句子，回答是用Yes，it is.还是Yes，she is. 啊？

——不要死记硬背，要了解规则和原理。死记硬背的常识会叫你一直糊涂。

道理就是：人称代词不只指代名词，还指代 “指示代词”。用 it 指代 this, that；用 they 指代 these, those。两个问句的主语是指示代词 this,that，不是作表语的名词 mother, sister。故回答是用Yes，it is.