Dangling modifier
SAT glossary · Course Foundations
Definition
An introductory modifying phrase whose action cannot be performed by the first noun after the comma ('Having reviewed the sediment cores, the conclusion was inescapable'). The passive voice is where dangling modifiers hide, because it demotes the true agent into a prepositional phrase, which can never contain the subject.
Dangling modifier in plain English
A dangling modifier happens when a descriptive phrase at the START of a sentence doesn't actually connect to whoever comes right after the comma — logically, the action described in that opening phrase can't have been performed by that first noun. For example: 'Having reviewed the sediment cores, the conclusion was inescapable' — a 'conclusion' can't physically 'review' anything, so the phrase is left dangling with no real subject to attach to. This error especially loves to hide in PASSIVE voice sentences, because passive voice pushes the actual person doing the action into a prepositional phrase (like 'by the geologists') — and a prepositional phrase can never legally serve as the sentence's main subject, leaving the introductory phrase with nothing valid to modify.
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