A 30 percent chance of showers and thunderstorms, mainly after noon. Mostly cloudy, with a high near 67. Friday Night. A slight chance of rain showers before midnight, then a slight chance of rain and snow showers.
Answered by The WikiAnswersÂ® Community. Making the world better, one answer at a time. an explanatory sentence is explaining what you said in your topic sentence. an explanatory sentence is explaining what you said in your topic sentence.
An open sentence is a statement which contains a variable and becomes either true or false depending on the value that replaces the variable. The negation of statement p is  not p, symbolized by ~p. A statement and its negation have opposite truth values.