“Do you know if it's mandatory?”
There's a meeting scheduled for this afternoon. You're busy with other work and don't really want to go. You're not sure whether attendance is required at this meeting. When a coworker asks if you're going, you ask this.
Do you know if it's mandatory?
Want Video and Sound? Follow us on YouTube
In casual spoken English, people often ask, "Do you know if ___?" to find out the answer to a "Yes" or "No" question. For example:
Do you know if you're having a boy or girl?
Do you know if he's awake?
Answers to "Do you know if...?" can include:
Yes, it is.
Yeah, he is.
No, they're not.
No, I don't think so.
I'm not sure.
No, I don't know.
In formal English for writing and for situations where you don't know people well, you usually use "whether" instead of "if":
Do they know whether the child is a boy or a girl?
When you say that something "is mandatory", it means that you have to do it. Examples of things that are "mandatory" include:
- a mandatory meeting
- mandatory reading (books you have to read for a class)
- mandatory retirement (making people retire when they reach a certain age)
- mandatory military service (men in some countries have to serve in the military for a few years)