Is the pen__ __ __ __ blue?你在寻找的那支钢笔是蓝色的吗?

Is the pen__ __ __ __ blue?你在寻找的那支钢笔是蓝色的吗?
Is the pen__ __ __ __ blue?你在寻找的那支钢笔是蓝色的吗?

Is the pen__ __ __ __ blue?你在寻找的那支钢笔是蓝色的吗?
you are looking for
说明：这是个定语从句,省略了关系代词that/which.
如有不明白的地方,请继续追问!百度英语达人竭诚为你解答!

you are looking for

you are looking for 考察定语从句

Is the pen（that）you are looking for blue?
其中（that）you are looking for 作为pen的定语从句。将这个疑问句改成陈述句就是
The pen（that）you are looking for is blue.
当然，that还可以用which替换