Although Spanish often borrows English terms like "e-mail" and "password" to talk about terms related to the internet, Carlos provides us with several more proper Spanish alternatives.

Carlos teaches us how to conjugate Spanish verbs for commands, also known as the imperative mood, with the informal second person singular pronouns, "tú" and "vos."

Carlos teaches us the imperative conjugations of some commonly used verbs with the second person singular pronoun, "tú," as well as the formulas for creating the imperative with pronouns such as "usted," "vosotros" or "vosotras" and "ustedes."

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.

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.