Carlos explains to us about cardinal numbers in Spanish, which are used to count and quantify elements.

Carlos explains to us about ordinal numbers, or those numbers used to express order or succession.

Carlos teaches us a plethora of Spanish demonyms, or proper nouns used to refer to the natives or inhabitants of certain countries, states or cities.

Carlos speaks to us about the nuances of Spanish collective nouns, which are nouns that refer to a number of beings within a specific category.

Carlos familiarizes us with some Spanish social media lingo, specifically for Facebook and Twitter.

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."

To begin his lessons about diminutives and augmentatives, Carlos begins by speaking about suffixes, or endings added to words to alter their meaning.

Carlos explains how the purpose of diminutive and augmentative suffixes is to express increased or decreased intensity of the word to which they are attached and gives us some common examples in Spanish.

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.