The demonstrative determiners this/that, these/those use to point to something that is close or distant. The closeness can be in:

- space (next to the speaker, 20 metres from the speaker, 1000km from the speaker)
time (now, yesterday, last week, next year)
- Like all determiners, demonstrative determiners come at the beginning of a noun phrase, so they come in front of any adjective(s).

Example :
1. I like this food.
2. I use these pens.
3. Can you see those birds?
4. Do you remember that man we met last week?