1. Ending a sentence with an interrogative word:
You can absolutely end a sentence with an interrogative word (like "who," "what," "where," "when," "why," or "how") if the sentence is a question. For example:
* "Who is coming to the party?"
* "Where did you put the keys?"
* "Why did you do that?"
2. Ending a sentence with a question mark within a sentence:
You can also end a sentence with a question mark within a sentence, but it's generally considered grammatically incorrect. It can be confusing and create an awkward flow. For example:
* "I wonder what happened? It's strange." (This would be better rewritten as "I wonder what happened. It's strange.")
3. Ending a sentence with a rhetorical question:
Rhetorical questions are questions that are not meant to be answered. They are used for emphasis or to make a point. You can end a sentence with a rhetorical question, but it's not technically grammatically correct. For example:
* "Do you really think that's a good idea?" (This is meant to be a statement, not a question that needs an answer.)
In summary:
* You can end a sentence with a question mark if the sentence is a question.
* Ending a sentence with a question mark within a sentence is generally incorrect.
* Ending a sentence with a rhetorical question is a stylistic choice, but not strictly grammatically correct.