1, 2, 3, 8, and 9)
These are comma splices. They are each two independent clauses connected by a comma. You need to replace the comma with a coordinating conjunction or semicolon. You can also say, "It is a pen, my pen", where "my pen" is an appositive. And you can do the same for the other 2.
6, 7, 10, and 11 are all correct.