using the past modals to show degrees of certainty
by using the form of ( must have V3) to show that the action was almost certain .
( could/might/ may have V3) to s how that it is possible
( couldn't have V3) to show that it is not possible
Jackie87 is from/lives in Syrian Arab Republic and has been a member of iSLCollective since 2012-03-05 16:07:32. Jackie87 last logged in on 2015-07-06 15:05:29, and has shared 16 resources on iSLCollective so far.