Rules For articles undefined.

1. example

2. example

3. example

4. Indefinido

4.1. a and an

4.1.1. example

4.1.1.1. I have a ball. .

4.1.1.1.1. She is with a man.         sixty kilometres an hour

5. Definido

5.1. the

5.1.1. example

5.1.1.1. The moon is bright                                He live in my house, the house is comfortable.

6. They are used to refer to someone or something in the singular

7. example