THIS and THESE
This is singular These is plural.
These and this are used to talk about things which are near in place or time.
“Is this your book?”
“Are these your shoes?”
“Do you like this music?”
Or when making a phone call:
“Hello, this is Judi.”
THAT and THOSE
That is singular. Those is plural
That and those are used to talk about things which are not near to us or happened I; the past.
“Is that your house over there?”
“Did you see that film last night?’
“Who told you that?”
Or when making a phone call you could say, “Is that Michael?”
“Are those your shoes under the chair?”
“I like those flowers in that garden.”