Would you please give me a hand?Otherwise I cannot finish th

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/06/05 04:00:11

Would you please give me a hand?Otherwise I cannot finish the work_____.
为什么空格处选before he comes,而不是when he comes?

efore和when 都可以引导时间状语从句.选那个在语法上都没有错.但在语意上只能选before 引导的时间状语从句.
before 在...之前
When 当...(注意:when引导的从句谓语动词可以在主句谓语动作之前、之后或同时发生)
1．从句动作发生在主句动作之前.
①When he had finished his homework,he took a short rest.
当他完成作业后,他休息了一会儿.(先完成作业,再去休息)
2.从句动作发生在主句动作之后.
②When I got to the airport,the guests had left.
当我赶到飞机场时,客人们已经离开了.(客人已离开了,我才到)
3．从句动作和主句动作同时发生
When ／While ／As we were dancing,a stranger came in．
当我们跳舞时,一位陌生人走了进来.
楼上的两位只用"When"的第三种情况(当.时候)来解释,是没有说服力的哟.
但是通过偶所举例句,你会发现When引导的时间状语从句不论动作发生在主句动作"之前""之后"或是"同时发生"其时间间隔是很短暂的.
根据句意,你请求帮助,当然是想"he"回来之前把活干完呀.
其实这句话凭语感也会直接选"before"引导的时间状语从句的.
解释这么多,是不想你受汉语思维的影响.
你能帮个忙吗?否则他回来的时候,我完不成任务.
你能帮个忙吗?否则在他回来之前,我完不成任务.(汉语这么表达反而觉得"生硬",因为我们还是比较含蓄的呵呵)

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