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.

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

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.

I have not eaten anything today.

Everyone has seen that movie.

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

My sister is being annoying today, but usually she is nice. (We use progressive tenses for actions that are temporary)

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

If we are late, they will be angry. * Being late is a real possibility, so you should use the first conditional.

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

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

He is not really nice-looking, and yet he has enormous charm. Use a comma before any coordinating conjunction connecting two independent clauses.