It is under the bed.(改为一般疑问句)

题目

It is under the bed.(改为一般疑问句)
His coat is under the bed.(对画线部分提问)
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Are they be hind the door?(作肯定回答)
It that his key?(改为复数形式)

答案

is it under the bed?
where is his coat?
yes,they are
are these his keys