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hadthelittleScotchlad,Ferguson,allowedthebusybraintogotosleep这里的had作什么成分?hadthelittleScotchlad,Ferguson,allowedthebusybraintogotosleepwhilehetendedsheeponthehillsideinsteadofcalculatingthepositionof

题目详情
had the little Scotch lad,Ferguson,allowed the busy brain to go to sleep这里的had作什么成分?
had the little Scotch lad,Ferguson,allowed the busy brain to go to sleep while he tended sheep on the hillside instead of calculating the position of the stars by a string of beads,he would never have become a famous astronomer.这句话的第一个单词had翻译成'如果'吗?语法是怎样的?
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答案和解析
这里用的是虚拟语气“要是,如果”
原句是
If the little Scotch lad,Ferguson had allowed the busy brain to go to sleep ····· ···
虚拟语气条件句中,若含有were,should或者had ,可以省略if 再把were,should或者had 移到从句句首 使用倒装
eg Had I known your address,I would have written before.=If I had known your address,I would have written before.我要是知道你的地址 早就给你写信了.