PSAT Writing — where a sentence ends, and the mark that says so

Punctuation questions on the PSAT are really questions about where one sentence stops. Almost every mark in this material is decided by the same move: cover the punctuation, read what is on each side of it, and ask whether each part could stand on its own.

There is a format difference here worth explaining, because it is deliberate. The real test shows four versions of a sentence differing only in a comma or a semicolon. This platform's duplicate-answer check reads four punctuations of one sentence as the same answer four times and refuses the material outright — so the sentence is printed once and the four options are instructions in words: replace the comma with a semicolon, add a comma after "spring", remove the colon so the list follows the verb. The judgment asked for is the same, and arguably a little harder, since you have to name the repair rather than recognize it.

Three questions give two complete sentences joined by a comma, and the three standard repairs are spread across them: a semicolon where the second continues the first, a period where the two are separate facts, and a comma plus a joining word where the sense needs one — there "so" is right and "because" reverses the cause. Two give a fragment, and they are different kinds: one is a clause beginning "Because" that leaves the reader waiting for a main clause, the other a phrase beginning "Working" that has no subject at all.

Two turn on an interrupting phrase fenced on one side and not the other, once with the opening comma missing and once with the closing one, since the fault looks quite different from each direction. Two turn on what may stand before a colon, including a semicolon placed in front of the single word "salt" — a colon may introduce one word, a semicolon may not.

Two are apostrophes. The "its" question puts a wrong one and a right one in the same sentence, so the reader has to test each separately rather than apply a verdict to both; the test is to read "it is" back in and see where it collapses. And one question is correctly punctuated already, because knowing when to leave a sentence alone is part of the skill.

No contested usage appears anywhere here. Singular "they", the serial comma and sentence-final prepositions are live arguments among careful writers rather than settled rules, and a practice material has no business keying one of them.

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• Test whether each side of a joint could stand alone, and choose among a period, a semicolon and a comma plus a joining word
• Choose the joining word the meaning requires, not merely one that fits grammatically
• Recognize both kinds of fragment: a clause that leaves you waiting, and a phrase with no subject
• Fence an interrupting phrase at both ends, and spot which end is missing
• Apply the rule that what stands before a colon must be a complete sentence
• Tell 'its' from 'it's' by reading 'it is' back into the sentence
• Form the possessive of a plural noun that already ends in s
• Recognize a sentence that needs no change at all

Written for the Standard English Conventions domain of the PSAT/NMSQT Reading and Writing section, following the boundaries and punctuation skills the College Board's own published description names: sentence boundaries, the punctuation of supplements and nonessential elements, and possessives. Because four options differing only in punctuation cannot be represented on this platform, each sentence is printed once and the options are stated as instructions; the judgment required is unchanged. Every person, firm and place is invented for this material, and nothing is taken from any College Board publication or released test.