The main difference between 'when' and 'while' is that 'when' expresses single actions but 'while' expresses continuous actions.

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​Like actions in SImple Present, and actions in P. Continuous

​What is the difference?

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I am preparing this document now in my office, while my cat is licking her paws.

​While

I helped my mother around the house when I was home.

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​When

​Difference

When=single actions While=on-going actions

​Indicating time

​When Vs. While

​Two actions

'When' and 'while' are both used to show two actions that are happening at the same time. However, there is a small distinction that requires your attention.

Some text here about the topic of discussion

​When Vs. While

​Two actions: one single, the other continuous.

• He called when I was sleeping.

• He called while I was sleeping.​

When or while goes before the continuous action.

​When Vs. While

​Two actions: one continuous, the other single.

• I was sleeping while he called.

• I was sleeping when he called.​

If we change the sentence around, then pay attention with the use of "while"