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What is a signal phrase, and why is it important?
It's a phrase, clause, or even sentence which leads into a quotation or statistic. These generally include the speaker/author’s name and some justification for using him or her as an expert; it may also help explain why you're providing the quote/statistic.
Examples:
Patti Pena, mother of a child killed by a driver distracted by a cell phone, points out that “…”
Radio hosts Tom and Ray Magliozzi offer a persuasive counterargument: “…”