We can start with this gorgeous fractal which shows
the distance through the depth of a black hole.
Black Hole - Fractal eXtreme Footage
from Arthur Stammet on Vimeo.
Demonstratives show us when
something is near or far from who speaks.
You can understand it easily with this fun lesson.
Beginning English - 8 - This, That, These, Those -
Basic English Grammar For Beginning Learners
from EnglishAnyone on Vimeo.
You can use:
1. In front of a noun. ADJECTIVE
2. Alone, when it is clear what are you talking about. PRONOUN