where is it? lts a box(改为复数句) whatisit—it'abox改为复数句

It's a pencil-box.(\u6539\u4e3a\u590d\u6570\u53e5\uff09

They are pencil-boxes.
\u6b63\u89e3\u8bf7\u91c7\u7eb3

\u590d\u6570\u53e5
what are they? they are boxes.

复数句为：
where are they?
They're boxes.
分析：疑问词、形容词、介词短语、副词是没有单复数之分的；
只有名词、动词、代词有单复数形式。
如：is/am的复数是are，it/he/she的复数是they; him/her的复数是them；I的复数是we；me的复数是us；三单的复数是原形；was的复数是were；名词的单数变复数的时候，前面的冠词要去掉。
例如：He is a doctor.
复数：They are doctors.
I work in the office.
复数：We work in the office.
She studies hard in the class .
复数：They study hard in the class .

Where are they？

They are boxes.

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