求两组英语句型的解释could have done 和 couldn't have doneshould have do

求两组英语句型的解释could have done 和 couldn't have doneshould have do could't do 和could't have done还有could do,could have done的区别和用 can have done和could have done有无区别?can't have done和couldn't h couldn't have done? should have done ,shouldn't have done.could have done,couldn 有没有can have done sth?could have done sth有两种意思吗?can't/couldn' should have done和shouldn't have done,couldn't have could't have done和can't have done的区别 could have done和should have done can have done和could have done的问题, can have done 和could have done 的区别 could have done和would have done的区别