i could have done better if i was more carefully.you known 语法对吗

I could have done without 怎么翻译? could never have done could not have done I have Never .The girl be Done`` will be done和will have done是什么情况could have been呢 in retrospect,i could have done more with my lives I could have done anything worse than a Could have done would have done should have done could have been done ,could have i really dont know what i could have done yesterday evening without your help为什么要用could have done ?should have done 行不行? could never have done 造句 how could you have done how could I have done为什么加have done为什么不说,how I could done ,还有这句话怎么翻译如果是正常语序,是不是I could have done I could have done better ,but i didn't .I felt so sad .I' m sorry. I have done what I could do 是对的还是I have done what I could do 是对的? have done与have be done would have done,might have done,could have done,should have done分别表示什么意思? should have done ,shouldn't have done.could have done,couldn't have done