Question

a simple subject can be either a noun or a/an..........

is is a noun and a pronoun?

Answer 1

http://members.cox.net/lenco1/grammarpractice/

Go through the different parts of speech to help yourself learn to recognize them.

http://www.uottawa.ca/academic/arts/writcent/hypergrammar/partsp.html
Use the "table of contents" at the left to navigate this website. It's open to the parts of speech section; what do you find?