在英语中，询问和说明原因可以用多种方式表达。
一种常见的方式是使用祈使句，例如：
Can you explain why?
Could you tell me the reason?
Please let me know the cause.
这些祈使句都表示询问对方提供原因的意图。
另一种方式是使用问句，例如：
What is the reason for this?
Why did this happen?
How did this come about?
这些问句可以用来询问事情发生的原因。
示例对话：
A: Can you explain why the project was delayed?
B: Sure, there were some unexpected challenges that we had to overcome.
A: What is the reason for the price increase?
B: The cost of materials has gone up.
A: Why did the plan change?
B: We received new information that required us to adjust our approach.
在这些例句中，A 是询问原因的人，B 是提供原因的人。