is supposed to have done 跟 was supposed to do 的有区别吗,

题目

is supposed to have done 跟 was supposed to do 的有区别吗,
举个例子,The train is supposed to have arrived an hour ago跟The train was supposed to arriave an hour ago.这两个句子都是一个意思吗,

答案

这两个句子(Is supposed to have done/Was suppose to do) 有区别.但你举的列子,是正确的.－－ TRAIN这个列子,是一个意思.Is supposed to have done:是应该有去做完了.was supposed to do:是（过去式）应该做了.have...