This is your sister That is myThis is your sister That is my brotherHe is my sonNo,it isn 'tYes it is 改为复数形式

问题描述:

This is your sister That is my
This is your sister
That is my brother
He is my son
No,it isn 't
Yes it is
改为复数形式

应该是 this is your sister? yes she is

These are your sisters.
Those are my brothers.
They are my sons.
No,they aren't.
Yes,they are.