that's an eraser ______ _____an eraser?(一般疑问句) this is a cup (攺为复数形式)those are (red books)提问_______ ________ thosethey are (my sisters and brothers)提问______ ______ ______?
问题描述：
that's an eraser ______ _____an eraser?(一般疑问句) this is a cup (攺为复数形式)
those are (red books)提问_______ ________ those
they are (my sisters and brothers)提问______ ______ ______?
答
that's an eraser __is__that__ _____an eraser?(一般疑问句)
this is a cup (攺为复数形式)these are cups
those are (red books)提问__what are_____ ________ those
they are (my sisters and brothers)提问___who are they___ ______ ______?
答
Is that an eraser? There are some cups.What are those? Who are they?
答
如下
It that an eraser?
These are cups.
What are those?
Who are they?