or dangling modifiers, become a problem if a reader has to pause to work out how a sentence should be understood. For example, 'Driving up to the house, her dog always barks loudly.' That split-second hesitation while you work out what's going on can be avoided by writing 'Her dog always barks loudly when she drives up to the house.' We still don't know if the dog's in the car or in the house, but at least it's not driving.