The SAT colon rule: the part that matters is BEFORE the colon
"The kit includes: gloves, a pipette, and two slides." That colon is wrong, and almost nobody hears it.
Why it happens
A colon feels like an announcement, so we place it wherever a list is about to start. The SAT's rule ignores what comes after entirely: the words to the left of the colon must form a complete sentence on their own.
See the trap
"The kit includes ___ gloves, a pipette, and two slides."
"includes: gloves" — "The kit includes" is not a sentence; it is missing its object.
"includes gloves, a pipette, and two slides" — or rewrite as "The kit includes three items: gloves, a pipette, and two slides."
How to actually fix it
- 1Read only the words to the left of the colon.
- 2Could you put a period there and have a sentence? If no, the colon is wrong.
- 3What follows a colon can be anything — a list, a word, a full sentence. It is never the deciding factor.
Practice this trap · 6 real questions
Each of these is a question from the free bank that turns on the mistake above — the trap is the reason its wrong answer looks right. Easiest first.
FAQ
Does the same rule apply to dashes?
A single dash used to introduce something works the same way: sentence on the left. That is why the SAT often offers a colon and a dash as two spellings of the same correct answer — and then only one of them is in the choices.
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.
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