Don't use THE when talking about things in general.

Everyone has seen that movie.

You don't need commas if "and" is used to indicate addition.

Use a comma before and when adding three items or more.

The teachers* We use "the" when talking about a specific group.

If I were a child, I would play outside. * Second conditional = If + past tense, subject + would/could/might. The second conditional is used for unreal cases.

My father thinks I should stop smoking. * In this sentence, the verb think is a state verb. It is generally not used in the progressive (~ing) tense.

It was raining when I got home last night. * Use past progressive for a longer action that was interrupted by a shorter action in the past.

I fell asleep while I was watching TV. *After while use past progressive.

I have not eaten anything today.

There are twenty-two students. We commonly used there is/are to express existence.

IBGE, the Brazilian Institute of Geography and Statistics, is an important institution. Don't take for granted that your readers know things.