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Diagramming Practice – Public Speaking

Diagram the following conditional statement and find its contrapositive: “To be a good public speaker, it is essential that one rehearses in front of a mirror.”


This is a tricky sentence to diagram because it does not feature one of the common diagramming indicator words.  However, it does use the word “essential,” which is basically a synonym for “necessary.”  So, the statement tells us that rehearsing in front of a mirror is necessary for something else.  So, we will put “rehearse in front of a mirror” in the necessary slot in the diagram.  Then, to fill out the rest of the diagram, we can put the other term, “good public speaker,” on the sufficient side.

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