关于may(not)/might(not)have+p.p的改写1.Wearesurethetripwasveryinteresting.（must/be）Thetrip.2.HecalledKeithseveraltimes,butnooneansweredthephoneKeith.

Question

关于 may(not)/might(not)have+p.p的改写
1.We are sure the trip was very interesting.（must/be） The trip.2.He called Keith several times,but no one answered the phone Keith.

Answer 1

1.The trip must have been very interesting.(这是对过去发生的事的肯定推测)2.Keith might not have been home since no one answered the phone.(对过去事物的不太肯定的否定推测) Keith couldn't have been home since no one answered the phone.(对过去事物的否定推测)