当问句为"Is that your sister?"时,答语为什么?

当问句为Is that your sister?时,答语为什么? Is that your brother?这个问句有几种回答? Is that a pen?Is that a pencil?(合并为一个选择问句) That's your suit 怎么变问句 That man is my grandfather的问句 That is all right 的问句是什么 Is that your computer? that is your pen. Is that ( ) your sister is that your friend? is that your desk? Is that your Your room is si dirty.You must____ it clean. that is your bilk is------------- is that your eraser(改写为复数形式) 英语句子单数变复数急解Thsi si my sister.what is that those aren it your books.Is this your parent 否则我明天中午又要挨饿了!随便告诉做这些题的方法! Is that a pen?Is that a pencil?把两句合并为一个选择问句 Wang Fang is (ten)提问ten table,is,watch,on,your,the(连词成句）打错了，table,is,watch,on,your,the(连词成句）成句后为问句。