We keep seeing the "Black Lives Matter" slogan all around — what's it all about? Well, it's a long story. Here's part of the story in a nutshell.

A sentence can be formed from multiple independent clauses, and could in theory go on forever! But is this really a good idea? Olivier and Gina offer us some helpful guidelines.

Lots of English words can serve as nouns, verbs, or adjectives depending on the context. Sometimes even the pronunciation changes. Let's look at the slogan "Black Lives Matter" in both a grammatical and historical context.

This video will show you, in simple terms, the difference between an independent (or "main") clause and a dependent (or "subordinate") clause. It's important to remember than a dependent clause depends on the independent clause, and does not make sense on its own.

Relative pronouns such as “who,” “which,” or “what” can link two “relative clauses.” Gina and Olivier review what we have learned and give us some final tips on studying English sentence structure.

We have a look inside the story of The Ugly Duckling to see how the verbs work. First on the list is the past continuous tense.

Sigrid looks at the regular and irregular verbs in part one of her rendition of The Ugly Duckling. As you listen, you can pause whenever necessary in order to practice the pronunciation of the conjugated verbs.

Booking a room by phone in a new language can be a challenge. This video will show you some typical questions you'll be asked, and how you can answer them.

In English, we use a lot of phrasal verbs. Let's see how they work using some examples from the story of the Ugly Duckling.

In order not to forget anything, Luana and Austin have made a list of the clothes and other items they need to pack. Austin reads the list while Luana gathers the items, and then they discuss their strategy for getting to the airport on time.

Sometimes it's hard to know how to pronounce the "-ed" ending of a regular verb in the past tense. Here are plenty of examples, taken from the story of the Ugly Duckling.

Many of us have to deal with traffic on a daily basis. Here's how to talk about it in English, include expressions such as "traffic jam," "bumper-to-bumper," and "bottleneck."

When we talk about traffic, it's not only about cars and trucks. We can talk about people on bicycles or on foot, too. They have some special rules to follow, especially in the city.

What exactly is it that makes Yabla such a fun and effective language learning tool? Amy explains what she enjoys about using Yabla, and how we can gain the most from the experience.

There is a lot of talk about how 3D printing could revolutionize the way that we make stuff. But what is 3D printing and how does 3D printing allow us to make almost anything from nothing? Professor Tim Minshall, Head of the Institute for Manufacturing at the University of Cambridge, explains it in this video, which is targeted at school-age students.