7.C End Marks and the Purpose of a Sentence (STL-1.O)

The words in a sentence can stay identical while the end mark changes what the sentence does. A period closes a declarative sentence and commits the writer to it: the claim stands, and the writer owns it. A question mark turns the same words into something unresolved, asking the reader to supply the judgment the writer withheld. An exclamation point does neither job well. It doesn't argue or assert anything new; it just signals that the writer felt strongly while writing the words before it.

This matters most at the places where an essay is supposed to be proving something. If a body paragraph builds evidence toward a claim and then closes with that claim phrased as a question, the writer has quietly stepped back from the one job the paragraph existed to do. The reader notices, even if they can't name why the paragraph feels unfinished: nobody actually said the cut caused harm, they were just asked to agree that it's obvious. Punctuation choice at the end of a sentence is a decision about who is responsible for the idea.

This sits right beside the grammar-of-clauses work in the unit, because end marks are the last joint in a sentence, not just decoration after it. A writer who understands subordination and coordination still undercuts a strong independent clause by letting it trail off into a question or lean on an exclamation point instead of a reason. The fix is always the same: make the sentence state the claim, then build the evidence that earns it, rather than reaching for a different mark to do work only argument can do.