In the short lecture, we'll be discussing word parts. So all words are made out of various word parts and there are three major types of word parts. We have the first part which is called a 'root'. A 'root' has a specific meaning and can occur at the beginning, middle, or end of a word. The next type of word part is called a 'prefix'. Prefixes are added to the beginning of the word, and the third type of word part is called a 'suffix'. Suffixes are added to the end of a word. Now we're going to discuss each of these three word parts briefly. So we start with roots. Roots are words from either latin or greek, and a lot of academic vocabulary is formed from these root words. For example, the root 'bio' means life ,so an example word with this root 'bio' is biology which is the study of life. We have the root 'biblio' which means book, and an example of this root is 'bibliography'. 'Ling' is another root which means language, and we can form the word 'linguistics' from this root word 'ling'. Linguistics is the study of languages. Prefixes are a type of word part that changes the meaning of the word, and again remember that prefixes go at the beginning of the word. For example 'micro-' is one type of prefix. It means 'very small', so if we look at this example we have 'micro-' which means 'very small' plus the word biology which again means the study of living organisms. We put those two word parts together 'micro' and the word 'biology' together, and we get 'microbiology' the study of very small living organisms. Here's another example. This is a very common prefix, one of the most common prefixes. 'un-' which means 'not', so we have 'un-' plus the word 'happy'. This is a very simple example, we come up with the word 'unhappy' or not happy A final example is 'il-' 'Il-' is another prefixe which means 'not'. It's very common as well. We have 'il-'. We add that to the word 'legal' and we get 'illegal' or not legal, so you can see that when we add the prefix to a word it changes the meaning of the word. The third word part is the suffix. So, suffixes change the word form or the part of speech. One very common suffix is '-er', and as you can see we have a little dash here that means that it's going to be a suffix ,or it's going to go at the end of a word. So we have this example. We have the word 'teach' which is a verb, and we add the suffix '-er' which mean which means 'a person who', and we get the word 'teacher', so we can see that we start with the verb teach we add the suffix '-er' and it changes it from a verb to a noun. Take a look at another one, '-less'. This is another very common suffix. We can take the word 'care' we add '-less' to it. , and we get the word 'careless', so we start with a noun 'care', we add the suffix and we get an adjective, and the final example 'I-Z-E' or '-ize' is a suffix that we add to the end of the word. For example, we have the word 'final'. We add 'I-Z-E' to it, and we get 'finalize', so we have a word which is an adjective 'final' we add 'I Z E', and it turns into a verb. So, it's important to know the three types of word parts because if you know the three word parts and the meaning of each type of word part, you can sometimes pretty accurately guess the meaning of word just based on the word parts.