Take another look at the sentence:

Groaning on rusty springs, the trampoline tossed the children like clothes in a dryer.

Groaning on rusty springs, a participle phrase, comes right before the noun trampoline. This is a clear and logical pairing of target and modifier. There is no error.

Before you continue, review the rules for misplaced and dangling modifiers.

Go to the next sentence.

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