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老师，你好！
1)Hewas watching TV as we ate.
2)Hewas watching TV while we ate.
3)Hewas watching TV when we ate.
以上3句含义是否一样？假如不同：
第一句和第二句是不是一样？
第三句是不是意味着“等大家吃完了之后，他正在看电视”？
a)Hewas watching TV as something exploded.
b)Hewas watching TV when something exploded.
a)和b)这2句含义是不是一样？？？
He was watching TV while we were eating. 二个持续性动词同时平行发生，用while引导从句。
He was watching TV when something exploded. 某事正发生时，另一件事忽然发生，用when引导。
其他为用词不当，不是差异问题。
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