I can answer this question. Although my spoken English is not very good, I am familiar with the vocabulary of College English Band 4 and Band 6. I have summarized a table for you to have a rough look at first:

meaning

1, these English [? Me? Z], beauty [? Me? Z] British pronunciation is the same as American pronunciation.

Pronouns these; These, they (used to explain or ask for approval);

Detectives/determiners (used before noun phrases to refer to people or things that have been mentioned) these; (used in spoken language to introduce people or things in a story) some

These ();

2. They are clever [? e？ ], beauty [? e？ British pronunciation is the same as American pronunciation.

Pronouns them; They; They; Used to replace him or her, referring to a person of unknown sex; (generally speaking) people, everyone, everyone;

use

Usage of these

They are mainly used as determiners, pronouns and adjectives, which means "these" when used as determiners, "these" when used as pronouns and "these" when used as adjectives.

These are my books.

These are my books.

I'm going to the library to borrow these books.

I want to return books to the library.

We have been working hard these days.

We have been working hard these days.

Their usage

They are the plural form of the third person, regardless of gender, representing some people or things that have already been mentioned. They are often used as subjects in sentences, usually after the noun it refers to and occasionally before the word it refers to.

Women used to think that they were shelved at the age of 30.

In the past, when a woman reached the age of 30, she was considered to be over the age of marriage.

They are going to move to a new house next week.

They will move into their new house next week.

I have a dog and a cat, but they always fight.

I have a cat and a dog, but they always fight.