When do you use which word?
You use this when its a single object that is close, for example: this cup.
You use that when its a single object that is far, for example: that cup over there.
You use these when there are more than one objects close to you, for example: these cups.
You use those when there are more one objects far from you, for example: those cups over there.
Why are we learning this?: So we can easily tell someone if something(s) is/are far away, or close!