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