The present perfect tense in Spanish is used when an action in the past occurs within a time period that has not yet concluded. Carlos clearly explains how this compound verb tense is formed as well as giving us several examples.

The many types of past tense in Spanish can get confusing for English speakers. In this lesson, Carlos focuses on the simple past tense, or preterite, providing us with some excellent examples.

Carlos explains to us the range of meanings that the verb "tocar" can have in Spanish, depending upon the context.

The word, "vaina," is popularly used in many Latin American countries, and according to Carlos, who explains its origin and diverse uses, "defines everything and nothing at the same time."

Carlos explains to us, with examples, situations in which the present perfect tense should be employed.

In addition to beginning his explanation regarding situations in which the past imperfect tense is commonly used in Spanish, Carlos explains to us how to conjugate regular -ar, -er and -ir verbs as well as sharing with us some of the most common irregular verbs and their imperfect conjugations.

Carlos explains in detail the correct use of the negative form of the imperative tense, providing several examples.

Carlos explains to us in detail the imperative of the first person plural with many examples as well as providing us with the conjugations for several reflexive verbs.

Do you get confused when it comes to choosing between the prepositions "por" and "para"? In this series of videos, Carlos will clearly explain the difference between the two, with plenty of examples.

In the second part of this lesson, Carlos focuses on additional uses of the frequently confused prepositions, "por" and "para," particularly when talking about time and location.

We finish this series on the prepositions, "por" and "para," with some additional, quite common uses for you to put into practice.

There are two types of grammatical agreement in Spanish: noun agreement and verb agreement. In this chapter, Carlos explains to us the concept of noun agreement. Let's see what it's about!

In this second part of this lesson on grammatical agreement, Carlos explains verb agreement, or the necessary correspondence of number and grammatical person between a verb and its subject.

The terms "matemático" and "matemática" in Spanish can be used in a variety of ways, in singular and in plural, as nouns or adjectives, to mean different things. Carlos explains this and more in this introduction to Spanish math terminology.

Carlos shows us how to express the four types of mathematical operations in Spanish as well as teaching us terms that are frequently heard on the news and in studies.