This is 是什么句型?怎样变疑问句

如题所述

这是一个陈述句。例句如下:
This
is
a
pen.陈述句
Is
this
a
pen?Yes,it
is
.No,it
isn't.一般疑问句
What
is
this?
it
is
a
pen.特殊疑问句
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