could have done sth. 和should have done sth.有什么区别吗谢谢了，大神帮忙啊

Question

The accident could have been avoided.这个事故本来是可以避免的。 可以写成是The accident should have been avoided.吗

Answer 1

could have done sth. 本可以 should have done sth.本应该 如果改成The accident should have been avoided.那么意思不一样，翻译成这个事故本应该避免。

Answer 2

could have done sth. 是指那件事本来是可以不发生的，但是由于一些原因发生了 should have done sth. 是指本来该做那件事，但是却没有做