DEMOSTRATIVES
THIS
USE
'This' is used to denote a singular thing.
EXAMPLES
This is my house. This is a nice bowl of soup.
THESE
USE
'These' are used for plural ones.
EXAMPLES
These are our friends, Janet and Robin. Whose packets are these?
THAT
USE
'That' is used in singular circumstances.
EXAMPLES
That is my house. That is a great job.
THOSE
USE
'Those' are used in plural scenarios.
EXAMPLES
Those are very expensive cars. Those are beautiful flowers.