While
兩件事同一時間發生,而兩件事發生時間都係較長
例子:While he was talking on the phone, he was holding his baby.
when
兩件事同一時間發生,而其中件事發生時間係較短
例子:When the phone rang, he was holding his baby.
“Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.”
― Martin Luther King Jr.