We use these and those for plural nouns. these books/those books
We use this and these for things that are near.
We use that and those for things that are far.
Watch this silly video by english4u, a British teacher in Saudi Arabia, to see the difference:
Watch Paul's video to learn how to pronounce the th sounds in this, that, these, and those.
This, that, these, and those are adjectives when they come before a noun:
- I want this book. I don't want that book (or that one).
- These videos are good for reviewing grammar. Those videos have English songs.
- What is this?
- Please give me some of that.
- These are my friends.
- I want those.