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The demonstrative adjectives, this, that and their plural, these, those used with nouns, eg:-I want this house, not that house.
If these words are used without the noun, they are demonstrative pronouns, eg:-This is what I can do...
eg:-Well, that is exactly what I can do.
eg:-That is a good idea I can handle!
eg:-This is where I can jump!
eg:-This is my friend; and these are my two girlfriends.
eg:-Are those your friends? I believe you, but there are those who can't.
eg:-My seat was next to that of Mary. Compare her grandmother's dress with those of today!
-----These pronouns, besides taking the place of a noun,suggest the idea of a 'position" with regard to the speaker.eg:-this(these) being nearer in space or time, that(those) being more distant.
-----"can" is used to say that something is possible or that somebody has the opportunity to do something.eg:-That's the fact that you can come to the meeting on Monday.eg:-That's the fact that you can play the piano. eg:-That's the fact that the famous DVD can be rented from your local store and the super-markets!