While Vs When – What’s the difference?

source: Learn English with Let's Talk    2017年5月19日
http://www.learnex.in/while-when-diff...
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While
1) When two continuous actions are happening at the same time we will use “while”
Eg: I am teaching while my brother is out playing football.
When
1) When two single actions happen at the same time or one action happens right after the other we used “when”
Eg: He called me when I got home
Eg: When I ate, I felt better.
2) Ages and periods of life
Eg: I used to walk a lot when I was young
Eg: I graduated when I was 21.
3) Used as a question (to know the time)
Eg: When do we leave from here?

But what happens when we have a continuous action and a single action in the same sentence. Do we use “while” or “when”? Now that’s a tricky question. But I’ll make it very simple and clear for you.
Eg: He got into a fight while we were shopping.
In this case, you can use both “while” or “when” mainly because the single action comes before the continuous action
But if we change the sentence around we say
Eg: We were shopping when he got into a fight. (Single action comes after the continuous action)