could't do 和could't have done还有could do,could have done的区别和用

could't do 和could't have done还有could do,could have done的区别和用 求两组英语句型的解释could have done 和 couldn't have doneshould have do could't have done和can't have done的区别 can have done 和could have done 的区别 could have done和would have done的区别 should have done和could have done的区别? could have done 和 might have done 的区别 could never have done和could not do有什么区别 I thought I could have done it 和 I thought I could do 有什么区别? can have done和could have done有无区别?can't have done和couldn't h could have done和should have done could have done 和 can have done 有什么区别?还有would have done