text: Sure my man, I can tell you anything you need to know, but your question is a little broad. In your example sentence, "this" is used as the subject of the verb is. The words you gave as examples can all be used as different parts of speech. \n\nDirect Object-- The boy ate this/that.\nIndirect Object-- The boy gave this/that his attention.\nAdverbs-- Come here. Stand there.\n\n... and so on. So in answer to your question, it depends on how you use any of your above listed words as they can all be used as many different parts of speech. If you have more questions, feel free to email me or IM me, however tomorrow would be best as I'm sleepy. Oh, and one last thing, you might get a lot of retarded grammar answers that you need to ignore. THIS IS THE CORRECT ANSWER!