When and How to Use the Demonstratives "this," "that," "these," and "those"

Every semester I get asked by someone how people know whether to use "this," "that," "these," or "those."  

This --singular --close in proximity; or --something going on or under immediate discussion right now	These --plural --close in proximity; or --something going on or under immediate discussion right now
That --singular --further in proximity; or --something being discussed about that took place in the past or that will take place in the future	Those --plural --further in proximity; or --something being discussed about that took place in the past or that will take place in the future

The following resources do a good job of explaining this:

Website	Page Name	Comment
Woodward English	This - That - These - Those	A clear visual poster, followed by explanations
wikiHow	How to Use These and Those	A clear and clean explanation of this topic.
British Council	this, that, these and those	Explanations, followed by a self-administered quiz.
YouTube (Learn English with Rebecca)	this that these those	For a very good visual / audio explanation.

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