In this final part of the videos dedicated to accentuation, Carlos explains diphthongs, triphthongs and hiatuses.

Carlos explains to us the three manners of addressing a conversational partner in Spanish: "tú," "usted" and "vos." Although all three of these personal pronouns could be translated as "you," the one that is utilized in a particular context depends upon factors such as the region where one lives as well as one's relationship with the person with whom he or she is speaking.

Known as the "tuteo," the "ustedeo" and the "voseo," Carlos explains the historical roots and evolution of these varying ways of saying "you" in different parts of the Spanish-speaking world. Factors which affect which form is utilized by a particular person in a particular situation include that person's country of origin as well as the relationship between the speaker and the person to whom he or she is speaking.

Carlos explains the forms of address used to address several conversational partners: "vosotros" and "vosotras," which tend to be used in Spain, and "ustedes," which tends to be used in Central and South America.

Carlos teaches us a trick for conjugating verbs with the "voseo" and challenges us to distinguish verbs in sentences which have been conjugated with the "tuteo," "voseo" and "ustedeo."

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.