An SAT Reading & Writing micro-topic under Boundaries (Expression of Ideas + Standard English Conventions). Free to read — no account needed.
A modifier is a phrase that describes something. Many sentences begin with one, like "Tired after the long hike, ...". The rule is simple: the noun right after the comma must be the person or thing the phrase is describing.
When that noun is wrong, we call it a dangling or misplaced modifier, and the sentence says something it does not mean. "Tired after the long hike, the tent was a welcome sight" literally says the tent was tired. The tent cannot be tired — a person is. So the subject after the comma is wrong.
To check an answer, read the opening phrase and ask "who or what is doing this?" Then make sure that exact noun begins the main part of the sentence. "Tired after the long hike, the campers were glad to see the tent" fixes it, because the campers are the ones who are tired.
On the test, the choices often differ only in which noun comes first after the modifier. Pick the one where the first noun truly matches the opening phrase, and ignore any extra description tucked between commas.
Worked examples
Choose the option that fits the opening modifier: "Walking home from school, ______" (A) the rain began to fall on Maria. (B) Maria felt the rain begin to fall. The phrase "Walking home from school" describes the person doing the walking. Rain cannot walk home, so (A) dangles. Choice (B) is correct because Maria is the one walking, and she comes right after the comma.
Choose the option that fits the opening modifier: "Covered in fresh snow, ______" (A) the hikers admired the mountain. (B) the mountain looked stunning to the hikers. The phrase "Covered in fresh snow" describes what is under the snow. In (A) the hikers are not covered in snow, so it dangles. Choice (B) is correct because the mountain is covered in snow, and it comes right after the comma.
Choose the option that fits the opening modifier: "Founded in 1636, ______" (A) students have attended Harvard for centuries. (B) Harvard has taught students for centuries. The phrase "Founded in 1636" describes the thing that was founded. The students were not founded in 1636, so (A) dangles. Choice (B) is correct because Harvard is what was founded, and it comes right after the comma.
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