when: I was walking to school ............... I fell., We were watching TV .............. the lights went out., My friends were playing basketball ................ it started to rain., I was swimming in the sea ............. I saw a dolphin., Sandra was doing her homework ............. the phone rang., We were writing in our notebooks ............. the lights went out., I was studying for my maths exam ............... I fell asleep., The boy was listening to music .............. his mother called him., My friend was watching TV ............ his dog started to bark., I was reading a book ............. someone rang the doorbell., while: Someone rang the doorbell ................ I was reading., My friend's dog started to bark ............. he was watching TV., The boy's mother called him ............... he was listening to music., I fell asleep .............. I was studying for the exam., The lights went out ............. we were writing in our notebooks., The phone rang .............. Sandra was doing her homework., I saw a dolphin ............ I was swimming in the sea., It started to rain ................. my friends were playing basketball., The lights went out ............. we were watching TV., I fell .............. I was walking to school., I dropped my pencil .............. I was walking outside., I saw John ................. I was waiting for the bus.,

When or while?

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