Para los que tengan duda de cuando usar “the”
Espero que les ayude.

The

The is not used with the names of persons, languages, most countries, streets, or the time of day

Examples:

Mr. Smith is a teacher.

We are going to visit Dr. Brown.

We are speaking English.

Spanish is an important language.

Mary is going to Argentina.

John lives on State Street.

He goes to class at eight o'clock.

Some Exceptions:

The Mississippi River is in the United States.

The Dominican Republic is in Latin America.

The article the is usually not used when the noun phrase refers to something very general.

Examples:

John likes milk.

Mary is studying history.

Mary is studying the history of the United States.

John is studying the architecture of Greece.

John is studying English.