Final answer:
An appositive can interrupt or end a sentence, providing clarifying details about a noun. Its placement can influence a sentence's emphasis and help avoid run-on sentences or fragments.
Step-by-step explanation:
An appositive is a noun or noun phrase that renames or clarifies another noun right beside it. When constructing a sentence with an interrupting appositive, it is essential to set off the appositive with commas to clearly indicate the additional information being provided. For example, a sentence with an interrupting appositive might look like this: 'The book, a rare first edition, was the collector's favorite item.'
When an appositive ends a sentence, it typically follows the noun it explains or provides more detail about, often for the purpose of emphasis. Here's an example of a sentence with an appositive at the end: 'She handed in her final essay, a masterpiece of her research.'
In crafting sentences, it is important to take into account the placement of appositives, as they can help in achieving the right emphasis and in preventing run-on sentences or unintentional sentence fragments.