If you can touch it, use "this [one]." --> This one on my desk is blue.
If you cannot touch it, use "that [one]" --> That one over there across the room is red.
"one" here is a pronoun that stands for something like 'pencil.'
July 31, 2015
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"This" refers to a thing close to you, while "that" is used for things farther from you.
This is a pen. - it's here, close to me
That is my friend over there, - he isn't standing next to me, there is a distance between us
Hope this helps.
July 31, 2015
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I think "this one" is closer, "that one" is further.
I'm not good at English, but I hope it will be helpful to you. :)
July 31, 2015
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