This That These Those - Demonstrative Pronouns

We use THIS (singular) and THESE (plural) as pronouns to talk about things or people near us, whereas we use THAT (singular) and THOSE (plural) to talk about things or people not near us:

You can learn more on this with the following video and its worksheet:

http://learnenglishteens.britishcouncil.org/sites/teens/files/gs_this_that_those_-_exercises.pdf