When can you use a colon on the SAT?

After a complete sentence. The colon then introduces a list, a phrase that renames something in the sentence, or a second sentence that explains the first. Cover everything to the right of the colon: what is left must stand alone as a sentence.

Can you put a colon after a verb such as includes or are?

No. A verb leads straight into the words that complete it, and a colon cuts the two apart. A sentence such as The kit includes: a cloth and a brush is wrong for that reason, however tidy the list is. Take the colon out and the sentence is right.

Is a colon right after such as or including?

No. Those words begin a phrase and lead straight into the list, so the sentence has not finished when the colon arrives. The list needs no mark in front of it. Compare The shop sells tools such as saws and chisels.

Does the part after a colon have to be a list?

No. It can be a phrase that renames something in the first sentence, or a whole sentence that explains it. What decides the colon is the left side, which must be a complete sentence. What follows only has to deliver what that sentence promised.

Can a dash do the same job as a colon?

After a complete sentence, yes. A dash can introduce a list or an explanation in the same way, and the cover test works on it too. If what stands on the left is not a complete sentence, a dash that introduces a list is as wrong as a colon.

Colons: cover everything after the colon

Cover everything to the right of a colon. If what is left cannot stand alone as a sentence, the colon is wrong, whatever follows it.

1.Find the gap where a colon is offered. Cover everything to the right of it.
2.Read what is left. Does it stand alone as a sentence, with a subject and a verb that finishes the thought?
3.If it does, a colon is allowed. Check that what follows delivers what the sentence promised: a list, a name for it, or a sentence that explains it.
4.If it does not, the colon is wrong, however tidy the list that follows. A verb or a word like of, with or including leads straight into the words after it, so no mark goes there.

Try it on a question

Work it below before you open the working. The steps say what to do, and you can do each one yourself.

The beekeeper's shed at Wrenfield is a narrow room, mostly shelving for jars and frames. The hook by the door holds three ______ a smoker, a hive tool and a veil of fine netting. Everything else stays on the shelves until the day it is needed.

Which choice completes the text so that it conforms to the conventions of Standard English?

Choice A: tools;
Choice B: tools:
Choice C: tools,
Choice D: tools

1
Choose a sentence and cover everything to the right of the slot. Name what is left: a complete sentence, or not?
2
Try a colon in the slot, then the other marks. The lab says which are legal and gives the reason each time.
3
Notice the two sentences that end in the same list. One takes a colon and the other takes no mark at all. The list is the same, so only the words on the left can explain the difference.

What a colon needs

Sentence 1 of 5

A colon is decided on its left. Cover everything after it: what remains has to be a complete sentence.

The expedition carried three instruments the slot a barometer, a sextant and a brass chronometer.

1. Cover one side, then the other. Can each stand alone as a sentence?

Left of the slot

“The expedition carried three instruments”

Right of the slot

“a barometer, a sextant and a brass chronometer.”

2. Try the marks. Which are legal here?

Answer for both sides first.

The full working, and why each wrong choice is there

Cover everything to the right of the gap. "The hook by the door holds three tools" stands alone as a sentence, and it promises something: three tools, named. A colon introduces what a complete sentence has promised. A semicolon needs a sentence on its right, and a list is not one; a comma or no mark would not announce the list at all.

Choice A: tools;
A semicolon looks stronger than a comma and seems to suit a long list. But it needs a complete sentence on each side, and a list of three items is not a sentence.
Choice B: tools:the answer
The words before the gap form a complete sentence, and they promise three things. A colon introduces what was promised.
Choice C: tools,
A comma is the usual mark inside a list. But this gap comes before the list begins, and a comma cannot announce what a sentence has promised.
Choice D: tools
With no mark, the list runs on from the sentence as if the sentence had not finished. The reader gets no signal that a list is coming.

Use it when

One choice puts a colon before a list, and the others put a comma, a semicolon or nothing.
A colon is offered straight after a verb or a preposition, such as are, includes, from or with.
Two sentences meet at the gap and the second seems to explain the first.

Do not use it when

The choices differ in a verb or a pronoun, not in a mark. The colon test says nothing about agreement or tense.
Two sentences meet at the gap and the choices are a semicolon, a full stop and a comma with a joining word. Cover each side of the gap instead.
A word such as however or therefore sits at the gap. It joins nothing and needs its own test.

Five questions on this move

Untimed, and nothing is saved. A wrong first answer gets one more try before the working is shown.

Question 1 of 5

The market at Marrowby is busiest on a Saturday, when farmers come down from the hills with eggs, cheese and wool. It closes early on ______ stallholders spend the afternoon at the cattle auction two villages away. Shoppers who forget this arrive to find the square empty.

Which choice completes the text so that it conforms to the conventions of Standard English?

Five is a start

In your account there is a focused set of ten on Boundaries from the question bank, with the same one more try. And after each practice test, the drills your plan sets for the skills you missed name the moves for them.

Practise Boundaries in your account

How this page was checked

Every punctuation answer, by our rule table
For each of the 6 questions on this page, what stands on each side of the blank is recorded, and an automated test checks that our table of punctuation rules calls the keyed choice legal and the other three not.
The whole page, by a person
Not yet. Every question and every item of its lab was worked through in a browser by Claude, an AI assistant, on 14 October 2026. The page was published on 14 October 2026 before a person had read it. If something here is wrong, tell us and it is put right.

The questions were drafted with AI and are original: none is a College Board question, and none comes from the question bank behind our practice tests.

Where this comes from

“Cover the right of the colon” is one card from the Preptics lesson Boundaries: five distractors worth naming, which sits under the Digital SAT skill Boundaries. The lesson has the other cards around it, and its questions come back for review on a schedule. The lessons are part of the Digital SAT track.

Common questions

When can you use a colon on the SAT?: After a complete sentence. The colon then introduces a list, a phrase that renames something in the sentence, or a second sentence that explains the first. Cover everything to the right of the colon: what is left must stand alone as a sentence.
Can you put a colon after a verb such as includes or are?: No. A verb leads straight into the words that complete it, and a colon cuts the two apart. A sentence such as The kit includes: a cloth and a brush is wrong for that reason, however tidy the list is. Take the colon out and the sentence is right.
Is a colon right after such as or including?: No. Those words begin a phrase and lead straight into the list, so the sentence has not finished when the colon arrives. The list needs no mark in front of it. Compare The shop sells tools such as saws and chisels.
Does the part after a colon have to be a list?: No. It can be a phrase that renames something in the first sentence, or a whole sentence that explains it. What decides the colon is the left side, which must be a complete sentence. What follows only has to deliver what that sentence promised.
Can a dash do the same job as a colon?: After a complete sentence, yes. A dash can introduce a list or an explanation in the same way, and the cover test works on it too. If what stands on the left is not a complete sentence, a dash that introduces a list is as wrong as a colon.

Keep going

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