Here's the breakdown:
* Fragment: It's not a complete sentence on its own. It lacks a subject or a verb, or both.
* Explanatory: It provides additional information or clarification about the main sentence.
* Example: "I went to the store. To buy milk."
* "To buy milk" is the explanatory fragment explaining the purpose of going to the store.
Here are some key features of explanatory fragments:
* They are usually set off with a comma.
* They often begin with prepositions (like "to," "for," "with," "of," "in," etc.) or conjunctions (like "and," "but," "because," etc.).
* They usually follow a complete sentence, but not always.
Here are some more examples:
* "He was exhausted. From working all day."
* "She couldn't believe it. It was a miracle!"
* "The party was lively. Full of laughter and music."
* "I need to finish this project. By tomorrow."
Important Note: While explanatory fragments can add emphasis and clarity, they can also be seen as grammatically incorrect in formal writing. In general, it's best to use them sparingly and ensure they are clear and understandable.