Sigrid introduces passive causative constructions, which combine causal verbs and the passive voice. We use them all the time in everyday conversation when we focus on the object rather than the subject.

This segment lays out the building blocks of a passive causative construction. We also compare and contrast causative constructions with other similar constructions. Sigrid uses the expression "to mix and match," which means putting different things together in different ways.

It's time to mix and match the formulas we've talked about. Sigrid mixes and matches them to talk about stuff she can't or doesn't want to do herself. She invites you to do the same.

In the United States, there are rights that allow all people who are accused of something to defend themselves: "the rule of law" and "due process of law." Right now, these rights are being challenged, and so it's important to know what they're all about.

What a time to be learning English! Things are happening quickly in the United States and history is being made right now, so don't miss out on the words and expressions you need to know.

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.

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.

Sigrid describes an object and gives you about 4 seconds to come up with the name of the object. Then she gives you the answer. Watch the video twice to see if you can come up with the answer on your own.

Are you ready to think fast again? You've got this! You get four seconds to come up with each answer. Then repeat the video to make sure you really know all the words!

It's time to think fast again! This time it's a little harder, but focus on the words you know or recognize, and you might be able to guess the answer, even if you don't know the exact word in English. If you don't get all the answers, just watch the video again!

See if you can figure out what Sigrid is describing. Don't worry! She will give you a little time to think and then give you the answer (with some extra information, too).

Try to guess what word Sigrid is describing using the clues she gives you. Remember: You can always click "pause" if you need more time!

In this game, following the description is just as important, if not more important, than guessing the answer in English. Try visualizing what Sigrid is describing. You can also give yourself more time by hitting "pause" while the clock is ticking.

This episode of "Think Fast" is dedicated to the summer and the heat. Try to guess what Sigrid is describing!

Get ready for another round of "Think Fast!" Sigrid will describe some objects and you have to figure out what each object is. Even if you don't know the word for it in English, you are still doing great if you can visualize the object being described.