I just used Reed-Kellogg with students, who had never seen it, to try to show what a direct object was (and the accusative case). The sentence was "Cornelia amat Marcum" vs "Corneliam amat Marcus". I found it useful. I intend to explore its use more.
"Cornelia est puella Romana quae in Italia habitat."
Incidentally, here in the USA because of a mania for standardized testing of writing and reading ability the teaching of traditional grammar has practically disappeared. Only when students study a foreign language do they now run into a term like "prepositional phrase". It's insane! There is, however, a sizeable population of "homeschoolers" and they tend to be more traditional in their approaches.
Diagram this, Frank:
"Cogito ergo sum."
I'll have to wait until I get home from school, but I can describe it.
The "cogito" and "sum" will be in the upper right quadrant of two separate plus signs. The "ergo" will go on a dashed line joining the two simple predicates underneath the "cogito" one. "Cogito" will be capitalized. It's pretty cool about Latin that you don't need the subjective pronouns most of the time.
For English speakers that is hard to get used to, but I found when I became fluent in Portuguese that I loved that aspect of the language.
I meant "... Portuguese, I loved that..."