英语难题 Newton was playing under an apple tree ______ an apple fell onto his head.A.when B.while请选一个并说为什么

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英语难题 Newton was playing under an apple tree ______ an apple fell onto his head.A.when B.while请选一个并说为什么
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英语难题 Newton was playing under an apple tree ______ an apple fell onto his head.A.when B.while请选一个并说为什么
英语难题
Newton was playing under an apple tree ______ an apple fell
onto his head.
A.when B.while
请选一个
并说为什么

英语难题 Newton was playing under an apple tree ______ an apple fell onto his head.A.when B.while请选一个并说为什么
A
进行时+ when + 非进行时 I was wathcing TV when my mother came back.
进行时+ while + 进行时 I was wathcing TV when my mother was cooking.
记住这个区别就可以了

A
从句中是延续性动词用while,如果是终止性动词则用when

B

选A
此句是when引导的从句,意为“当... ...的时候”,主句常为现在进行时。

A.when是at or during the time that, 既指时间点,也可指一段时间;
while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。