<u>Answer:</u>
<em>A summary sentence should brief the whole content “what so ever the length of the original content” may be. </em>
For example, if you take a story, <em>moral will be the good example of summary. </em>One another example is when the teacher taught concept in the classroom, in the last few minutes of the class the teacher <em>would brief the whole into smaller points. </em>
Even nowadays, people go and visit movies only after seeing the review online. So once again the review is a small brief about the movie in one or two lines. <em>It should be crisp, use cherry-picked words, etc.</em>