Pronouns, reflexives and “there is”

Object pronouns (me, him, her, us, them) come after verbs and prepositions: Call me. It's for them. In short answers too: “Who's there?” — “Me.”

Reflexive pronouns: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves.

• when subject and object are the same person: I cut myself. Enjoy yourselves!
• for emphasis (“personally, without help”): I built it myself. by myself = alone.
• Many verbs are reflexive in other languages but not in English: I wash, I get up, I remember, I feel tired, I sit down, I hurry, we meet.
• each other = mutually: They love each other (each one loves the other) ≠ They love themselves.

you and they are used for people in general: You can't park here. They say it will rain.

there is / there are says that something exists; it refers to something already known:

There is a café near the station. It is very good. — There are two problems. — There was an accident. — There has been a mistake. — Is there any milk?