Sigrid looks at the comparative and superlative forms of adjectives that have a "Y" or an "E" at the end, and also some that don't follow any pattern at all!

With longer adjectives, we have to add some extra words in order to form the comparative and superlative. Sigrid explains how.

Modal verbs are special verbs that go together with action verbs to indicate ability, permission, obligation and more. Let's see how they work.

Every modal verb is a bit different and not all of them can be used in all tenses. We use "may" for permission, but we can use "can" and its conditional form "could" as well.

When do we use "should" and "could"? At the end of the video, you'll also find a preview of the next 2 videos where modals are used in everyday speech for discussing probability.

Sigrid has lost a couple of important items and is trying to think where they might be. In this part, she has lost her car key. She uses plenty of modal verbs to tell her story, including modal verbs expressing probability.

Now Sigrid has also lost her glasses! In this final part, learn how to use modal verbs to express probability, and find out whether she finds the missing items.

Pamela Anderson accepting the Linda McCartney Memorial Award on PetaTv, for her work for animal rights. Help to protect our nature and environment by clicking this link before you subscribe to Yabla.

President of the Polynesian Voyaging Society and Master Navigator Nainoa Thompson spoke about what the voyage of the seven vaka means to him and what the consequences are for the entire Pacific. The voyage motto of the Pacific Voyagers is: “Move your paddle slowly through the water.”

Join Karine as she goes behind the scenes at the University of Oxford, one of the world’s oldest and most prestigious educational institutions and alma mater to kings and presidents.

In this video, you can learn all about Oxford, England, a beautiful university town steeped in history. There are many places of interest spread among the many colleges that comprise the university.

Travel over the ocean and through the woods with Robby Naish, Kevin Langeree and Jesse Richman as they make their way down the West Coast in search of one-of-a-kind kiteboarding spots!

Robby, Kevin and Jesse have found a few great spots to kite along the west coast. Watch for some amazing scenery and kite-boarding skills.

We get a behind-the-scenes look at the kiteboarder's trip down the coast of California, where they are recharging their batteries and taking advantage of new surroundings.

Here's a video from the World Wildlife Fund. Traditionally, anaerobic digester systems have not been practical on small dairy farms, but this didn’t stop Sensenig Dairy, a 100-cow farm, from pursuing its goal. Then Sensenig teamed up with the local community to collect enough waste to produce 1,401,600 kilowatt hours of electricity per year from "trash" that would otherwise end up in a landfill.