this (pron. & a.) As a demonstrative pronoun, this denotes something
that is present or near in place or time, or something just mentioned,
or that is just about to be mentioned.
this (pron. & a.) As an adjective, this has the same demonstrative
force as the pronoun, but is followed by a noun; as, this book; this
way to town.
this [Something that is farther than "this" but nearer than "that".]
this [Used to refer to something between the speaker and the listener.]
this The indicated object, item, etc.
this An indicated thing that is near in space or in mind, as having been just mentioned.
Chambers DictionaryChamber's 20th Century Dictionary📕
this this, demons. pron. or adj. denoting
a person or thing near, just mentioned, or about to be mentioned:
(B.) the last past:—pl.These.—n.This′ness, hæccity. [A.S.
this, the neut. of the adj. pron. thes (masc.),
theós (fem.), this (neut.)—pl. thǽs
(=these), thás (=those); Ice. thessi, Ger.
dieser.]
Wikipedia
This is a demonstrative pronoun used to identify a noun. It describes something that is here or nearby ("This ball I am holding is red." or "This is my home."). A very easy way to tell if someone is using this the right way is if the object that they are talking about can be pointed to. For example, if someone says "this computer is mine," it should be possible to point to the computer. It does not matter if the computer (a noun) is in the room or in a picture.
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