Welcome back. In the previous presentation, we learned some tips that can help you learn new words in a more structured way. In this presentation, we're going to explore a strategy that will help you expand your vocabulary. Before we can explore this strategy, we need to define words part of speech. In English, each word is assigned to a particular part of speech. There are eight parts of speech in the English language nouns, verbs, adjectives, adverbs, pronouns, prepositions, conjunctions and interjections. An individual words can function as more than one part of speech when used in different circumstances. Now it's time to review the last strategy in the previous lesson. Do you remember it? It is a strategy that suggests identifying different parts of the word, including the root, suffix and prefix. Now let's practice. We're going to try this strategy by taking some words from the 30-word vocabulary list that you had in the reading part of this module. We will identify their part of speech and add suffixes and prefixes to make new words. The first word in our today's practice is consider, which is a verb. As you can see by adding different suffixes to the first four words, you have four new parts of speech and new meanings. Considerable is an adjective. Considerably is an adverb. Considerate is an adjective, and consideration is a noun. And in the last word by adding the perfect re, you can make another verb. The second example is another verb, interpret. Again each of the words that are listed here have different meanings, and part of speech. Interpreted is an adjective, interpretation is a noun, interpretable is another adjective, and another new noun interpretability. Next, let's look at another verb, estimate. Estimated is an adjective. Estimate can be a noun without adding any suffixes. Estimation is another noun. By adding the prefix pre, you can make another noun. And estimator is a noun as a bill. Let's try an adjective now. Stable can become a noun by adding the suffix, I-Z-A-T-I-O-N, stabilization. We can make another noun stabilizer. And two adjectives stabilized and unstable. This time, let's choose an adverb, significantly. You could make an adjective significant, a verb signify, another adjective signified. As well as insignificant, which is made with the help of a prefix. Imply is another verb on our list. You can change it to an adjective, implied. A noun, implication. Or by adding the prefix R-E, you can have a new verb, re-imply and a new adjective re-implied. Our last example is another verb, sustain. By adding ed, you will have an adjective, sustained. You could make a noun, sustainability, a verb, sustainably and another noun sustainment. These were few examples to practice the strategy, but of course you can try this with many other words. You can now go back to the vocabulary list, 30 essential words variety in the reading section of this module and keep practicing. This is the end of module four, congratulations. You completed course one. Course number two will be about the speaking and writing sections. See you in course two.