你哪部分不确定--用英文怎么说?which part do you not sure?or which part are you not sure?

你哪部分不确定--用英文怎么说?which part do you not sure?or which part are you not sure?
你哪部分不确定--用英文怎么说?
which part do you not sure?or
which part are you not sure?

你哪部分不确定--用英文怎么说?which part do you not sure?or which part are you not sure?
which part are you not sure?
or
which part do you not make sure?
sure is not a verb, so you can use it in the second way.

which part are you not sure? sure不是动词 故不能用do当助动词

which part you are not sure?

Which part are you not sure of?