The students were doing an exercise __ the bell rang., when, while, I saw an accident __ I was waiting at the bus stop., when, while, __ she was writing an e-mail, her computer turned off., When, While, __ my mum came home, my sister was sleeping., When, While, He fell down __ he was climbing a tree., when, while, We found some old photographs __ we were tidying our room., when, while, __ you called me last night, I was studying for the test., When, While, I had a bad dream __ I was sleeping on the sofa., when, while, She started to cry __ she was watching a movie., when, while, __ the fire alarm went off, we were listening to music., When, While

When VS while

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