将以下单词变为复数形式.句子单数变复数
carddaughtecousinfathersisterbrothersonpencilcasefamilybabydictionaryboyplayphotowatchbusclassitsheheyouIisamthisthat
Thisisabook
Thatisaneraser
Itisaredapple
Iamaboy
He/Sheisateacher
What’sthis?
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