This is his sister and that is his son.怎么改为复数形式

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Thisishissisterandthatishisson.怎么改为复数形式Thisishissisterandthatishisson.怎么改为复数形式Thisishissisterandthat

This is his sister and that is his son.怎么改为复数形式
This is his sister and that is his son.怎么改为复数形式

This is his sister and that is his son.怎么改为复数形式
These are his sisters and those are his sons. 满意的话请点击下面的“选为满意回答\”