Determiners
This, that, these, those, and possessives
Demonstratives: this/that/these/those
Pointing to things near and far: this book, that car, these shoes, those people
Possessive Determiners
Words that show ownership before nouns: my, your, his, her, its, our, their
There Is / There Are
Introducing existence: There is a book. There are many people.
Introductory It
It as empty subject: It's raining. It seems that... It's important to...