疑问句是语法中用于询问信息的一种句子结构。以下是一些疑问句的例子：
1. 一般疑问句：
Are you a student？
Do you like English？
Can you speak Chinese？
2. 特殊疑问句：
Where are you from？
How old are you？
What do you do for a living？
3. 选择疑问句：
Would you like tea or coffee？
Is he a doctor or a teacher？
Do you prefer cats or dogs？
4. 反问句：
Can you really afford to buy such a expensive car？
Don't you think it's important to stay hydrated？
Have you ever seen such a remarkable sunset？
疑问句可以根据不同的需求以不同的形式出现，以上例子展示了其中的一些类型。