Those are old toy soldiers （改成相应的单数形式） what‘s this?（用一只鸟进行回答

这道题的正确答案是：
Those are old toy soldiers （改成相应的单数形式）
That is an old solider.
what‘s this?（用一只鸟进行回答）
It's a bird.
what are those（用英语书进行回答）
They are books.
The boys are *playing football *in the playground（对画*部分提问）
What are the boys doing in th playground?
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