Take another look at the sentence:

Hunched over the keyboard for hours, Charlie used two fingers to hunt and peck out the 2,000-word research paper when lightning caused his computer to crash, Charlie wept more tears than the thunderclouds spilled rain.

Hunched over the keyboard for hours is a past participle phrase. A past participle phrase will often begin with an ed word like hunched. Charlie used two fingers ... is a main clause. An introductory participle phrase requires a comma when you connect it to a main clause that follows.

Go back to the sentence to try again.

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