Should have done，表示过去本应该做的事情，但却没做。其否定形式表示过去本来不应该做某事，但是实际上却做了。 could have done，表示：①对过去某种情况的怀疑或者是不确定（情态动词 推测. Could + have +过去分词 （been: Both reviewers suggested major revisions, and the editor rejected the manuscript.
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However, they mentioned that it could be resubmitted after making the required changes. 现在英语处于什么阶段？如果能看懂英英词典，查一下剑桥，牛津，韦氏等词典，里面解释很详尽，清晰。编写这些字典都是大神，就看你会不会用了。 1can/could i use your pen? I wish i could have gone with you to the concert last night.
我安装的是iguanatex1.60.3，除了这个插件外没有安装别的latex有关的东西。 点击生成后就报错如下： [图片] 这个错误应该怎么解决？ 显示全部 关注者 4
Could not convert string to float 使用float ()函数来转换字符串为浮点数是，python抛出valueerror，并提示，could not convert string to float，意思是无法将参数指定的字符串转换为浮点. The experts considered the likelihood that risks could become serious problems in the future.they. Be的过去分词） = could have been翻译字眼跟上面的一模一样 i could have been there on time if i had left home earlier.（能力） 我本可以准时到达那里.
