THIS , THAT, THESE, THOSE
– Determine a noun or pronouns
– They agree in number with the noun that they determine or that they replace

How to choose ?

THIS AND THESE
We use this (singular) and these (plural) as pronouns, to talk about people or things near us.

EXAMPLES:
I would like to buy this phone.
I would like to buy these shoes.

THAT AND THOSE
We use that (singular) and those (plural) as pronouns to talk about things that are not near us :

EXAMPLES:
Can I have this croissant, and that drink ?
Can I buy these shoes, and those sunglasses ?