And now I have to help son with homework about "linking" verbs and "helping" verbs. Only I don't know what they are. I have the worksheets in front of me, and I still don't know what they are. It's like they're asking you to explain why the cursor moves when you move the mouse. Dude, I don't know--it just does. Some smart person figured it out way back when and the rest of us get to bask in the results of his genius.