把英文陈述句改为一般疑问句 1.that is a blue ruler 2.it is his pencil 3.this is her pencil-case

Is that a blue ruler?
Is it his pencil?
Is this her pencil-case
Is that his green cup 非常感谢，不过能不能把每句话的中文意思说一下，谢谢那是一把蓝色直尺吗?这是他的铅笔吗?这是她的铅笔盒吗?那是他的绿色杯子吗?