This is my sister 改为复数句
These are my sisters
That is my friend改为复数句
Those are my friends
this Bob friend is my 连词成句
this is my friend Bob
That is your brother改为一般疑问句
Is that your brother?
Are these books?改为单数句
Is this your book?
Is she your mother作肯定回答
Yes,she is.
我是英语教师,答案百分百对