What are prefixes? Prefixes are added at the start of a word to change its meaning. If you understand what the common prefixes mean, it can help you understand new words. Let's take a look at the prefix meaning and sample sentence.

un = reverse, cancel, not ---> undo - unable - unwanted dis = not - ---> dislike - disagree - dishonest im /in/ ir = not ---> impossible - incorrect - irresponsible non = not ---> non-fat - non-living - non-profit re = again ---> redo - rewrite - rebuild mis = wrongly ---> misbehave - misspell - mishear anti = against ---> antisocial - antibacterial co = together ---> co-writer - co-ownership - cofounder ex = former ---> ex-wife - ex-president inter = between, among, ---> international - interfere mid = middle - midcourse - mid-afternoon - midday out = better than others ---> - outnumber - outsmart - outswim over = too much ---> overestimate - overload - overachieve pre - before ---> prepay - preschool post = after ---> postgraduate - post-war self = oneself ---> self-confidence - self-esteem sub = under ---> subordinate - subtitle super/sur = above, over ---> superhuman - surcharge under = beneath, below ---> underachieve - undergrowth

Read a full transcript of the video below:

Today we're going to learn something epic, one word prefix. Some of you might already know what this is, some of you might have never heard of the word prefix, and today, I'm going to teach you what it is, and it's going to change your life. Well, prefixes are added at the start of a word to change its meaning. And if you understand what the most common prefixes are, it can help you understand words you've never seen before. How amazing is that?

Hello, and welcome back to my channel, I'm Halima from Blackboard English and I'm excited to help you, support you with your English, so that you can become a fearless English learner and gain the freedom to dream bigger and live the life you want my friend Like I said before, today, we're going to be learning what a prefix is, I'm going to show you different examples and this will help you immensely you will be able to look at a word and understand a part of the meaning. So it's easier for you to guess what the word means.

Let's look at the first example. Un, un. So on means opposite. So if you think about on, it means opposite. It can also mean to cancel or the word not. So opposite, cancel, and not for example, undo, undo, unable, unable, or unwanted, unwanted. So if you look at those words, so do is undo is the opposite of do unable, is not able, and unwanted is not wanted. So now let's let's take a look at the next part. The next part is going to focus on the word 'not', so it all means tnot in different ways. So we're going to look at the first one which is dis, dis, so this means not for example, dislike, dislike, so not like disagree, not agree, dishonest, sorry, dishonest, not honest, and then you have 'im' 'in 'and 'irr'. So, this also means not, for example, impossible, incorrect and irresponsible. So, 'irr, 'in' and 'im' al meaning not not possible, not correct, and not responsible. You see where I'm going with this. So if you know the word responsible, for example, and then you see the word irresponsible, it will help you understand the word because you know now that 'irr' is not.

Now let's look at the next one, which also means not which is 'non', 'non'. And the example I want to give you is non-fat, non-living and non-profit. Right? So now we're done with not not we're going to look at R, E, so re. Re is the meaning is again, so redo, rewrite and rebuild. Next one is mis. So mis is wrongly So misbehave. So behave in a wrong way. misspell, spell in the wrong way and mishear. So you know the word hear, so it means that you can hear somebody speaking or a sound. When I put 'mis' in front of it, you now know that he heard in a wrong way. So maybe somebody said a word and you heard it in a different way and you felt sad because you heard it differently, or you made a mistake. Because you heard it differently. Or say sometimes somebody could say can you bring two bottles of water and you bring 20 for example. Here's a really crazy example, but you misheard what the person said so somebody can say you misheard. He said 20 not two. Okay, so that's misheard.

You heard wrongly. Let's move on. So the next one is anti, A, N, T, I, anti. So anything with anti in front of it, most things, it means against so anti-social, so against social settings or social gatherings, and then antibacterial, so against bacteria, so kills bacteria, right? So antibacterial, you probably heard of antibacterial before antibacterial gels, antibacterial wash, and so on.

Now, let's move on to 'co', co. So 'co' means together, together. So it means more than one person is working on a particular thing. So co-writer means that there's more than one person. So there's another person working on this thing.

Now let's move on to the next part. So 'ex', so this means former, anything that's in the past, so ex-president, you use 'ex' to understand that it's former in the past. So imagine that I say my ex-husband, I'm talking about somebody that used to be my husband in the past.

So the next one I want to talk about is mid, M, I, D, meaning middle, middle. So if I say mid-afternoon or midday, I'm talking about something that's in the middle of the day or the middle of the afternoon, for example, okay, so mid.

Then we have out so out, means better than others. So for example, outnumber outsmart outswim. So if you see something with out in front of it just means that you're comparing it to somebody else or something else the next one is over. So over means too much overestimate. So you estimated way higher than you needed, overload you put too much things inside something for example, you overloaded the truck and overachieve so achieving way more than or overachieve.

Okay, let's move on to the next one, which is 'pre', so 'pre' is before it means before for example, pre-pay or pre-school. So pre-pay for those of you that don't know means paying in advance, paying in advance and now 'post' means after so 'pre' is before post is after so postgraduate for example, postgraduate is when you finish graduation and you decide that you're going to do a higher education like master's programme and then post war that's self explanatory after the World War and then we have the next one which is self so self is basically oneself so talking about the individual yourself and so on, for example, self confidence, self confidence, or self esteem. Okay, so you're talking about the person's confidence or the person's or self esteem so esteem means respect and admiration for a person so in this case would be for yourself so self esteem is having self respect and admiration for yourself.

Okay, so before I go on, I just want to congratulate you for keeping up and watching this fall This is so great, it shows that you're super dedicated to learning English I hope that you're finding this lesson super useful because I know that if you focus take notes, it will really help you find understand words easier. Okay, let's go to the next one. So the next one is 'sub', 'sub', so sub think of a submarine. So it means under, under, so sub is under and for example subordinate which is somebody who is lower in a rank or position he's my subordinate, somebody who is working say for example, a sales assistant and a manager. So the subordinate would be the sales assistant and subtitle so when you have the main title then the secondary title so the title underneath the main title is called subtitle

Okay, let's go to the next one. So 'super' or 'sur', super or sur, for examples, superhuman, or surcharge surcharge? So superhuman is somebody that shows exceptional ability or powers. Sometimes you see we see in new movies we talk about how superheroes are superhuman they have these remarkable abilities, exceptional abilities, heroic over and over and above other human beings right. And then you have surcharge so surcharge, have you ever heard of this word surcharge. So surcharge is an additional charge or payment over, so overcharge okay, you can say in a different way you can say overcharge, but if you hear surcharge is the same as being charged more than the actual amount that you're supposed to be charged and the last word is under, so under can be beneath or below. So for example, under estimating under achieve under developed, all meaning that is beneath or below the level that the person estimated or it should be.

So, that's all for today, guys, thank you so much for watching, I hope that you've taken notes. If you liked today's topic, then I'd love it if you joined us in my monthly membership, where we take the English language to a whole new level, helping you enhance your skills and reach a level of fluency that will open doors for you and your future. To find out more go to www.blackboardenglish.com/yes. That's the end of the lesson. It would be incredible if you supported me by liking this lesson, sharing with your friends and subscribing if you haven't done so already. Take care of yourself, and I'll see you next week. Bye for now.