作业帮英语中何时使用wouldn,t have done shouldn,t have done couldn,t have done needn,t have donewouldn have done shouldn have done could have done needn have done 呢
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 07:59:46
英语中何时使用wouldn,t have done shouldn,t have done couldn,t have done needn,t have donewouldn have done shouldn have done could have done needn have done 呢
英语中何时使用wouldn,t have done shouldn,t have done couldn,t have done needn,t have done
wouldn have done shouldn have done could have done needn have done 呢
英语中何时使用wouldn,t have done shouldn,t have done couldn,t have done needn,t have donewouldn have done shouldn have done could have done needn have done 呢
wouldn't have done
是指'不会这么做' 一般用在一种假设的情况下 比如'如果我知道就不会这么做了'之类的
shouldn't have done
指'不应该这么做' 一般用在做了一件事然后表示后悔或者指出错误 像是'这件事不应该这么做'的感觉吧
couldn't have done
指'不可能这么做' 是指能力不足做不到 或者认为不是一个人可能的行为(比如A杀了人 B认为A不可能这么做 B可以说'he couldn't have done that')
needn't have done
指'不需要这么做' 一般是做完一件事后表示是不必要的
这四个可以根据意思来判断
would not have done 表将来
shouldn,t have done 本不应该做
couldn,t have done 本可以不做
needn,t have done本不需要做
这些都是虚拟语气，都可译为不该做了某事。wouldn't have done 表示意愿，不愿意做了；shouldn't have done 表示义务，不应该做了；couldn't have done 表示客观事实，不会做了；needn't have done 表示需要，不必做了。