Isthisyoursister?的回答关于一般疑问句的回答Is
关于一般疑问句的回答 Is this your sister?的肯定和否定回答究竟是Yes, is/No,it isn't.还是Yes,she is./No,she isn't. 为什么？
For example: 如果问Is this your sister? 则Yes,it is./No,it isn't. 如果问Is she your sister? 则Yes,she is./No,she isn't.