学习目标 ： 运用所学的知识进行人际交往，并做到学以致用。
（1）能掌握……名词单复数变化规则。
学习句型----- This is his sister. These are his sisters.
----That’s my brother. Those are my brothers.
----Is this （that） your sister ?Yes ,it is. No ,it isn’t.
-----Is this Jim ?No,it isn’t. It’s Dave.
（2）能运用……This is That is These are Those are 的句型熟练交际。
