A / an / the - exercises

A: is used before consonant sounds words. Ex: a dog, a cat. a bike, a home, a university, a european, etc. (the "u" and "eu" before the words university and european sound as "you". For this, you need to use "a" , not "an" as article.

An: is used before vowel sound words. Ex: An apple, an orange, an hour, etc.

(the "h" before hour is silent. For this, you should use "an", not "a".

We use the to specify thing and a to generalize things.
Ex: Do you have a car? (whatever car).
The car is over there. (i know the car).
The is used with superlative adjectives.
Ex: The most beautiful, the biggest, etc.
The is used with the expressions "go to" the.
Ex: go to the gym.
The is not used with the names of persons, languages, most countries, streets, or th time of day, but we have some exceptions: the dominican Republic, the United states, the Mississipi River, the Netherlands.
Ex: Mr. Smith is a teacher.
We will visit Dr. Brown.
We are speaking english.
Spanish is empirtant language.
Mary is going to Aregentina.
John lives on Cadena Street.

The is use, when it exists only one thing.
Ex: the sun, the universe, the moon, the earth, the equater, etc.
The is used the expression " the same " for comparison. Ex: The same idea.
A is used to refer to a thing for the first time. The is used to the second time, that's to say, to precise.
Ex: I have a car. The car is blue.
We don't use a before non-count nouns. Ex: "sugar," "love," "air," "odor," "water," "anger," "rain," "light,"etc.