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as soon as的用法

来源:学生作业帮 编辑:拍题作业网作业帮 分类:英语作业 时间:2024/04/29 01:37:30
as soon as的用法
它到底是怎么用的呢,例如主句中是一般现在时那从句中用什么时态啊?
下楼不对啊 我这里有一个题目。
he said he would look up the new words as soon as he found a dictionary.
as soon as连接的时间状语从句中,指未发生的动作,规律是:主句一般将来时,从句用一般现在时代替一般将来时
如:I will tell him the news as soon as he comes back.
指紧接着发生的两个短动作,主从句都用一般过去时
如 He took out his English books as soon as he sat down
就这两种情况 ,熟记就行.
在宾语从句中,当主句为与过去时的时候,从句必须用与主句相对应的时态,所以为了与主句动词said呼应,时间状语从句中的will look up应该对应为过去将来时态would look up,finds对应为found