这是我的哥哥.英语：这些是我的朋友.英语：那些是我的两个姐姐.英语：那是她的妈妈.英语：她的父母亲是她的好朋友.英语：T

这是我的哥哥.
英语：This is my brother.
这些是我的朋友.
英语：These are my friends.
那些是我的两个姐姐.
英语：Those are my two sisters.
那是她的妈妈.
英语：That's her mother.
她的父母亲是她的好朋友.
英语：Her parents are her good friends.
That is a backpack.(改为复数句）
Those are backpacke.
These are his brothese.(改为单数句）
This is his brother.
Is this your grandfather?(做否定回答）
No. it isn't.
Gina is my good friend.(改为一般疑问句）
Is Gina your good friend?
My father and mother are teachers.(改为同义句）
My parents are teachers.