In ordinary intercourse the phraseology of nearly all propositions is elliptical.
Let us take some examples.

Suppose that the expositor is in London, say in Regent's Park and in Bedford College, the great women's college which is situated in that park.

He is speaking in the college hall and he says, 'This college building is commodious.' The phrase 'this college building' is a demonstrative phrase.

Now suppose the recipient answers, 'This is not a college building, it is the lion-house in the Zoo.' Then, provided that the expositor's original proposition has not been couched in elliptical phraseology, the expositor sticks to his original proposition when he replies, 'Anyhow, _it_ is commodious.' Note that the recipient's answer accepts the speculative demonstration of the phrase 'This college building.' He does not say, 'What do you mean ?' He accepts the phrase as demonstrating an entity, but declares that same entity to be the lion-house in the Zoo.

In his reply, the expositor in his turn recognises the success of his original gesture as a speculative demonstration, and waives the question of the suitability of its mode of suggestiveness with an 'anyhow.' But he is now in a position to repeat the original proposition with the aid of a demonstrative gesture robbed of any suggestiveness, suitable or unsuitable, by saying, '_It_ is commodious.' The '_it_' of this final statement presupposes that thought has seized on the entity as a bare objective for consideration.
We confine ourselves to entities disclosed in sense-awareness.