Punctuating Clauses
Use semi-colons, colons, and dashes to mark boundaries between independent clauses, choosing the appropriate punctuation based on the relationship between the clauses
What a learner can do afterwards
- Join two related independent clauses using a semi-colon in place of a conjunction
- Use a colon to introduce an explanation or elaboration of the first clause
- Replace commas with dashes to create stronger pauses between clauses for emphasis
1 · Read
You already know how to join two independent clauses with a comma and a joining word, like 'and' or 'but'. There are three more marks you can use instead: the semi-colon, the colon, and the dash. Each one tells the reader something different about how the clauses connect.
A semi-colon (;) joins two independent clauses that are closely related and equally important. It works like a soft stop, gentler than a full stop, and it stands in for a joining word. 'It was late; the streets were empty.' Both parts could stand alone as sentences, but the semi-colon shows they belong together.
A colon (:) works differently. It introduces an explanation of the clause before it, as if the first clause makes a promise and the second pays it off. 'She had one goal: she wanted to win the race.' The colon tells the reader, here comes the explanation.
A dash (-) creates a stronger, more dramatic pause than a comma. Use it when you want emphasis: 'He had one plan - to win.' To choose, ask yourself: are the clauses equal partners (semi-colon), does the second explain the first (colon), or do you want extra emphasis (dash)?
A dash can also work in a pair. Wrap two dashes around an extra thought in the middle of a sentence: 'My neighbour - the one with the loud dog - waved at me.' The pair makes the extra thought stand out more than commas would. Try the lift-out test: if you remove the words between the dashes, the sentence should still work on its own.
Semi-colons link equal clauses, colons introduce explanations, and dashes add emphasis: pick the mark that matches the relationship between your clauses.
2 · Watch
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Where it sits
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Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
24 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.