Describe the rules for using question marks in sentence construction.

The rules for using question marks in sentence construction are as follows:

1. Question marks are used at the end of direct questions. These are sentences that ask for information or seek clarification. For example: "What time is it?" or "Did you finish your homework?"

2. When a sentence contains both a question and a statement, the question mark should be used at the end of the question portion. For example: "I wonder, will it rain tomorrow?"

3. In sentences that express doubt or uncertainty, a question mark can be used even if it is not a direct question. For example: "She said she would be here on time?"; here, the question mark indicates uncertainty about the statement.

4. When a sentence contains a tag question, which is a short question added at the end to confirm or seek agreement, a question mark is used. For example: "You like ice cream, don't you?"

5. Indirect questions, which are statements that report a question without using the exact words, do not require a question mark. For example: "He asked if I had seen the movie."

6. In sentences that contain both a question and an exclamation, the question mark takes precedence. For example: "How could you do that?!"

7. In informal writing, such as text messages or social media posts, question marks can be used to convey a sarcastic or rhetorical question. For example: "Nice weather we're having, huh?"

8. It is important to note that question marks should not be used after indirect commands or requests. For example: "She asked me to pass the salt?"; here, a period should be used instead.

Overall, the use of question marks in sentence construction is essential for indicating direct questions, expressing doubt or uncertainty, confirming information, and conveying tone or intention. It is important to follow these rules to ensure clear and effective communication.