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When we get into trouble with the participles is when something
separates them from the noun theyre supposed to modify so
that they get attached to the wrong noun because its closeror
worse, when the noun isnt there at all. This is most likely
to happen when the participle occurs at the beginning of a sentence,
introducing a phrase that precedes the main clause (the part of
the sentence that can stand on its own). The classic dangling participle
occurs in a sentence with this syntax:
<participial phrase>,
<main-clause subject> <main-clause verb>.
The problem that crops up here is a problem of relationship,
just as we discussed in the introductory
article. There is nothing wrong with this syntax; these examples
are all incorrect because of the relationship of the participial
phrase to the noun that is the subject of the main clause:
1. Waiting in the queue, the processor routes each message according
to its priority.
2. Switching to standby mode, the power indicator turns amber.
3. Left to fend for himself after school, the mother worried
about her young son.
4. Swollen from the bee stings, the doctor prescribed antihistamine.
In every case, the closest noun eligible for modifying is the first
thing that follows the commathe first noun in the main clause.
So what we have here is
1. a processor that is waiting in the queue, instead of a message
2. a power indicator that is switching to standby mode, instead
of whatever is supposed to do the switching (a system?)
3. a mother who is left to fend for himself after school, instead
of a childand note that the reflexive pronoun himself
is also the wrong gender for mother
4. a doctor who is swollen from bee stings, instead of whoever
is being treated (a patient?)
Sometimes the dangling participle produces a sentence that just
sounds absurd, even if we can puzzle out what the writer really
meant. And sometimes there is no way to figure out the meaning from
the information given. Either way, the sentence fails to communicate
clearly.
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