They can change the background or the set up of the play to change the mood
The passage of the Seventeenth Amendment granted U.S. citizens the right to vote for Senators for the first time in 125 years when it was passed in 1913.
Depends on the person who is teaching and if it is a 21 word thingy or it may be a paragraph.
Tone is created through word choice, sentence construction/ word order, and by what the viewpoint is focusing on.
