In the wooded valley, a pine squirrel falls prey to the voracious bobcat. Here we find some of the oldest and tallest trees on earth: The giant sequoias, which are now a major attraction for visitors to the park.

A relaxing bobcat family is surprised by the appearance of a young black bear. Elsewhere, a raven family is threatened by the presence of a bald eagle circling above their nesting site.

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.

Tommy confronts his sister, who had told him that his girlfriend died while he was in prison. Christy is still very much alive, and Tommy, still in love, rushes to her apartment.

Kate lives in Grand Lake, Colorado, a small town that is considered the gateway to Rocky Mountain National Park. Kate’s friend Tom is inspired by the cold and recent snow to go out and take a plunge in the icy lake!

About her Eurovision-premiered song, singer Rosa Linn says, "I think we’ve all been at a snapping point, where it felt like there’s no way out and that the entire world is just crumbling down around you. You start questioning everything, including yourself..."

The imposing rock faces of Yosemite are very popular with sport climbers, and the rocky heights are also home to the endearing American pika. Mule deer, many with fawns, inhabit the lower valley, which is awash with spring color.

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.

Enjoy another walk through the fields with pig brothers Piggeldy and Frederick. This time Piggeldy wants to know what a sheep is.

When Christy’s boyfriend shows up, Tommy is left in confusion and he needs to make a quick exit! He then has to visit the probation office, where at least he seems to be striking up a good rapport with his probation officer’s son.

It’s June, and Yosemite has come alive with noise and vibrant colors. The meadow flowers are in bloom, the bobcat kittens are almost full-grown, and the park’s unique amphibian and rodent populations emerge from their winter rest.

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.

The probation officer saves Tommy's job at Pirate Burger, and this time he’s entrusted to make a delivery. He uses the opportunity to try to make contact with Christy again.

In the lower valley, a foraging black bear attacks a colony of ants, which quickly rally to defend themselves. At its driest in summer and fall, the park is at the mercy of forest fires. One of the largest ever, the Rim Fire, broke out in the autumn of 2013, and burned out of control for over ten weeks.

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.