pencil case

Is it in your pencil case?(它是不是在你的铅笔盒里面？)

I can't find my book. Where's my pencil case?(我不能找到我的书了。我的铅笔盒在哪儿？)

There is a pen in my pencil case .(我的铅笔盒里有一个钢笔。)

You see, some of your money is in the pencil case on your desk.(你看，你的一些钱在你桌子上的铅笔盒里。)

In the big big bag, there is a big big pencil case.(在一个大大的书包里，有一个大大的铅笔盒。)

This isn't my pencil case.(这不是我的文具盒。)

Is there a pen in the pencil case?(在铅笔盒里有一支钢笔吗？)

Put the ruler in the pencil case.(把直尺放进铅笔盒。)

I have a new pen. The pen is in my pencil case.(我有一支新钢笔，这支钢笔在我的铅笔盒里。)

My mom bought me yesterday a new pencil case.(妈妈昨天给我买了一个新铅笔盒。)