Oxford Online English
How to Use the Past Perfect Tense in English - English Grammar Lesson
In this lesson, you can learn about the past perfect verb form. What does the past perfect mean? When do you need to use the past perfect? How do you use the past perfect verb tense correctly in a conversation? You’ll see the answers to...
Curated Video
Understanding Externalities and Their Impact on Society
The video explains the concept of externalities and how they can have negative impacts on society. It uses the example of a paper factory polluting a river and causing harm to fishermen and the environment. The video also suggests ways...
Oxford Online English
Present Perfect Verb Tense - English Grammar Lesson
In this lesson, you can learn about the present perfect verb tense in English. Does your language have anything like the present perfect? Many languages don’t have a similar verb form. This can make it more difficult to use the present...
Curated Video
I WONDER - Why Is Plastic Harmful?
This video is answering the question of why is plastic harmful.
Oxford Online English
English Verb Tenses Guide - Learn About Simple, Perfect, and Continuous Tenses
Are you confused about your simple, perfect and continuous tenses? Do you know how many verb tenses there are in English? In this lesson, you can get a big picture understanding of English verb tenses. You’ll learn what connects English...
Oxford Online English
Modal Verbs - How to Use Must, Have to and Should - English Grammar Lesson
In this lesson, you can learn about the modal verbs must, have to and should. Do you know the difference between 'must', 'have to' and 'should'? English learners often mix up these three verbs. In this lesson, you can learn how to use...
Oxford Online English
Modal Verbs - How to Use Must, Have to and Should - English Grammar Lesson
In this lesson, you can learn about the modal verbs must, have to and should. Do you know the difference between 'must', 'have to' and 'should'? English learners often mix up these three verbs. In this lesson, you can learn how to use...
Curated Video
Vanishing Species - Biological Diversity and Conservation
In this lecture, I introduce the topic of biodiversity, and talk about why biodiversity is important. I end the section talking about threats to biodiversity. Things like Habitat loss, habitat fragmentation and habitat degradation.
The Viral Fever
The Food Files: Panicking About Packaging
Today, weʼre not just looking into food, but also how itʼs stored and sold to us. Itʼs all about food packaging. From fancy long cartons to attention grabbing words and colors, food packaging is an integral part of food purchasing and...
Oxford Online English
English Modal Verbs - May, Might, Could, Can - Talking About Possibilities
The English modal verbs 'can', 'could', 'may' and 'might' are used to talk about possibilities. This English modal verbs lesson will help you learn how to use may, might, could, and can correctly. For example: - He can be really mean...
Oxford Online English
English Verb Tenses Guide - Learn About Simple, Perfect, and Continuous Tenses
Are you confused about your simple, perfect and continuous tenses? Do you know how many verb tenses there are in English? In this lesson, you can get a big picture understanding of English verb tenses. You’ll learn what connects English...
Oxford Online English
How to Use Will, Would and Might - English Modal Verbs Lesson
In this lesson you can learn about three verbs: will, would, might. These verbs can be really difficult to use correctly. In this lesson, you'll learn what these three verbs mean, and how to use will, would and might correctly in...
Oxford Online English
How to Use Will, Would and Might - English Modal Verbs Lesson
In this lesson you can learn about three verbs: will, would, might. These verbs can be really difficult to use correctly. In this lesson, you'll learn what these three verbs mean, and how to use will, would and might correctly in...
TED-Ed
TED-ED: The evolution of animal genitalia - Menno Schilthuizen
Genitals are the fastest-evolving organs in the animal kingdom. But why is this so? And what's the point of having decorative private parts? Menno Schilthuizen explains how the evolutionary biology of nature's nether regions uncovers a...
Oxford Online English
How to Use Must in English - English Modal Verbs
In this lesson, you can learn about the verb 'must'. 'Must' can have many different meanings in English. In this video, you can learn about the different meanings of 'must', and how to use 'must' in English. Continue practicing modal...
Oxford Online English
How to Use Can, Could and Be Able To - English Modal Verbs for Ability
In this lesson, you can learn how to use can and could English modal verbs to talk about ability. You will also learn about the verbs be able to and managed to to talk about ability. These verbs are not modal verbs, but we cannot use the...
Visual Learning Systems
Oceanography: Summing Up
The physical and chemical characteristics of ocean waters are discussed including salinity, temperature, density, and pressure. Footage from Maine, the Canadian Maritimes, and the Pacific coast highlight dynamic characteristics of the...
Oxford Online English
How to Use Would in English - English Modal Verbs
Learn about the modal verb 'would', the different meanings of 'would', and how to use 'would' in English in this free English lesson. Would you like to learn more about 'would' and what it means? If I asked you to tell me all the...
Oxford Online English
Using Would Have, Could Have, Should Have - English Grammar Lesson
In this lesson, you can learn how to use would have, should have and could have. Did you learn anything new in this lesson? Let us know in the comments! These verbs—would, should, could, etc.—are modal verbs, so they don’t have past...
Oxford Online English
Present Perfect Verb Tense - English Grammar Lesson
In this lesson, you can learn about the present perfect verb tense in English. Does your language have anything like the present perfect? Many languages don’t have a similar verb form. This can make it more difficult to use the present...
Oxford Online English
Modal Verbs - Introduction to Using Modal Verbs in English
In this lesson, you can learn about modal verbs, what they are, why you need them and how they work. Modal verbs, like 'can', 'must' or 'should' are very common in English. See this full free lesson on our website:...
Oxford Online English
How to Use the Present Perfect Simple and Present Perfect Continuous
In this lesson, you can learn about the present perfect simple and present perfect continuous verb forms. What’s the difference between ‘I have done’ and ‘I have been doing?’ When should you use the present perfect continuous? You’ll see...