Parallel structure: lists that change grammatical gear mid-sentence
"The internship involved drafting reports, attending briefings, and she led two workshops." Two -ing phrases and then a full clause.
Why it happens
By the third item you are reading for content rather than form, and the change lands past the point where your attention was. It is the same reason the error is almost always planted in the last item.
See the trap
"The internship involved drafting reports, attending briefings, and ___"
✗ The trap: "she led two workshops" — a clause where the pattern established two -ing phrases.
✓ The fix: "leading two workshops" — the third item now matches the first two.
How to actually fix it
- Write out the shared stem once: "The internship involved ___".
- Attach each item to it separately and read all three.
- Any item that does not fit the stem cleanly is the one being tested.
Made this mistake on a real question?
Practice Standard English Conventions questions here. Miss one and it is logged with the exact error, then brought back until you beat it.
Practice Standard English Conventions →FAQ
Does parallelism apply outside lists?
Yes — paired constructions like not only/but also, either/or, and both/and require matching forms on each side too, and the SAT tests those as well.
How do I stop repeating this mistake?
Reading the explanation isn't enough — your brain needs to beat the trap on a fresh question. Practice the skill in the kaoshen.co question bank: miss one and it is logged with the exact error, then brought back to you three days later and again after fourteen.