当他们回来时,我会要求他们打电话给你.Translate it into English

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/08/25 19:14:12

当他们回来时,我会要求他们打电话给你.Translate it into English
Please provide a better answer and explain in mandarin.
1)Once they come back,I will ask them to give you a call.
2)Once they came back,I will ask them to give you a call.

第一个较好,第二个严格来说是错误的.
从语义来看,他们回来的动作并没有发生,不可用过去式,而且由于主句时态也不一致.
在once引导的从句中可用一般现在时来代替将来时.

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