Dels posted...
if i invite you over for lunch and say "i'm making sandwiches" and then you get here and i serve out a bunch of hamburgers, that is not going to be what you expected. if i said "i had a sandwich for lunch" you are going to be even
more
surprised if it turns out i had a cheeseburger. in both cases you're probably imaging, like, slices of ham or turkey or something, often in between two slices of a loaf of bread, maybe other types of buns but not a hamburger bun.
If I say "I'm going to draw rectangles" and then you look at my drawings and they're a bunch of squares, that is not going to be what you expected. If I said "I drew a rectangle", you are going to be even
more
surprised if it turns out that I drew a square.