This is an apple.that is a pen.改复数形式

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Thisisanapple.thatisapen.改复数形式Thisisanapple.thatisapen.改复数形式Thisisanapple.thatisapen.改复数形式Theseareap

This is an apple.that is a pen.改复数形式
This is an apple.that is a pen.改复数形式

This is an apple.that is a pen.改复数形式
These are apples .Those are pens

These are apples.Those are pens.

thouse are pens