Re: how to interpret "Kim opened the parcel for half an hour"
[quote=guzhao67;375822]Kim opened the parcel for half an hour". This sentence is very odd. This grammar suggests the after half an hour Kim closed the parcel. Of course 'Kim opened the window for half an hour.' would be a more sensible example.
does the sentence mean "Kim spent half an hour opening the parcel?" If this is what you want to mean, say this or David's sentences. (half an hour)