New comparative test sentences

Well, for all the other examples, up above, we seem to be using _predadj not _subj so I don't see why this one should be different. It's is an abbreviation for "it is", and I believe link-grammar is correctly seperating out the 's from the it -- that is, this has exactly the same parse as "It is much colder today than it was yesterday.", doesn't it?

See up above: She's prettier than her mother" is same as "She is prettier than her mother", and we don't generate the _subj(be, she) for that one ...