1. Six-syllable words from a student who has never gone beyond three in his life.
2. A student breaks out multiple subordinate clauses and has never used a subordinate clause in his life.
3. Includes something like, "I shall now show..." I have no British students.
4. Has not a word "on paper" one day, and the next day has four pages completed.
Beyond all that, I get to see their writing across multiple grade levels over time. I know their styles and their voices in writing. The sterile voice of AI reverberates when they try to substitute it for their own.
One of my favorite things to do is to make the student read it aloud. Many just cop to the plea at that point. Others give it a try and within seconds, it becomes obvious that they don't know what the words mean. After a short while, most...most...figure out that it's just less trouble for them to write it themselves.
I have it comparatively easy in this regard. It's a nightmare for the math department. Their guess and my guess is that cheating on math homework is above 90% of students. And, mind you, we are now on standards-based grading (No A's, B's, C's, D's, F's), where homework accounts for zero/nada/bupkis in the gradebook, so the students actually doing math homework are the higher-achieving students. Come test time in math, they have enormous percentages of students, sometimes three-quarters of a class, "not meeting standards," i.e., "failing" in antiquated terms. Oh, and I should mention that under standards-based grading, students have unlimited retakes on tests until they "meet standards." What I'm saying is that it's even more difficult to detect or, more precisely, prove the AI cheating, and then the math teachers are left reteaching and reteaching and reteaching units, and regrading and regrading and regrading tests. Oh, and if after an entire year of not meeting standards, we no longer make students who "failed" retake the course over again the following year. No, instead, school districts now use "credit recovery." This is when failing students come in during the Summer for weeks, or sometimes just days, and magically make up the work for an entire school year in that small amount of time! Amazing! Of course, what happens is that the assignments are pared way down, or they only have to do the tests, not all the other work. So they retake, retake, retake the tests until they pass them and, voila, they're done! Graduation rates preserved!