this, that, these, those

singular	this	that
plural	these	those
	close to the speaker	more distant to the speaker (in space or time)

Generally speaking, we use this/these to refer to people and things, situations and experiences that are close to the speaker or very close in time. We use that/those to refer to people and things, situations and experiences that are more distant, either in time or physically.

Now do some exercises: 1, 2, 3, 4, 5, 6, 7