Question about time:
* When will you be home?
* When did you start working on this project?
* When is your birthday?
Specify a particular time:
* I will go to the store when I finish work.
* The meeting will be held when everyone arrives.
* I'll call you when I get there.
Other uses:
* "When" can also be used in conjunction with other words to express a specific time, such as:
* When you are ready
* When I get a chance
* When it rains
* "When" can also be used as a conjunction to introduce a subordinate clause that expresses time, such as:
* When the bell rings, we'll leave.
* When I was younger, I loved to play baseball.
Remember: "When" always refers to a time or a point in time.