Is it in your pencil case?(它是不是在你的鉛筆盒里面？)

I can't find my book. Where's my pencil case?(我不能找到我的書了。我的鉛筆盒在哪兒？)

There is a pen in my pencil case .(我的鉛筆盒里有一個鋼筆。)

You see, some of your money is in the pencil case on your desk.(你看，你的一些錢在你桌子上的鉛筆盒里。)

In the big big bag, there is a big big pencil case.(在一個大大的書包里，有一個大大的鉛筆盒。)

This isn't my pencil case.(這不是我的文具盒。)

Is there a pen in the pencil case?(在鉛筆盒里有一支鋼筆嗎？)

Put the ruler in the pencil case.(把直尺放進鉛筆盒。)

I have a new pen. The pen is in my pencil case.(我有一支新鋼筆，這支鋼筆在我的鉛筆盒里。)

My mom bought me yesterday a new pencil case.(媽媽昨天給我買了一個新鉛筆盒。)