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Hello and welcome to Six Minute Vocabulary, I'm Thin, and I'm Catherine. In today's program, we're looking at compound adjectives like in a 22 hour journey.

We'll look at what compound adjectives are.

We'll see how to use them, and they'll be a punctuation tip and a quiz and we'll leave you with a top tip for learning vocabulary. But first, let's hear from Rob.

Rob's a racing driver and he's being interviewed after a race.

Yes. And here's a question to think about while you listen. How fast was Rob's lap time? Let's find out.

Rob, congratulations on your latest win. What did that last victory mean to you? Honestly, I expected to win. I mean, you don't come second in a high quality vehicle like mine. That's true. It's an impressive motor.

But what you did was amazing. Your fastest lap time was truly incredible.

Well, you're right. You don't see a 70 second lap every day.

Thanks for your time, Rob.

Well, this year, the drivers are hoping to complete the four kilometer course in an even faster time.

So, Rob, the racing driver did a 70 second lap well done to you if you got that right. And that's our first example of a compound A. It's made with a number like 70 and a noun like second, 70 second. We put seventy second in front of another noun like lap making a compound adjective which describes a noun, a 70 second lap.

Let's hear another example again, starting with a number. But this time the noun describes lenth instead of time.

Well, this year the drivers are hoping to complete the four kilometer course in an even faster time.

So the number four with the noun kilometer go together to make an adjective for km2 and take note there's no s at the end of KM.

That's right. And there's no s because the word kilometer functions as an adjective here and we can't make adjectives plural.

So the adjective for KM describes the noun course a four kilometer course. That's right.

Some more examples with length are a 26 mile race, a six foot man.

Now for a punctuation note, when you write a number noun, compound adjective, you need to join the two parts together with a hyphen, a little horizontal line between the two words.

That's right. So you write a 70 hyphen, second lap, a six hyphen foot man.

You're listening to BBC Learning English. And we're talking about compound adjectives. Here's Rob again, listen out for another type of compound adjective.

Honestly, I expected to win. I mean, you don't come second in a high quality vehicle like mine.

Did you get that? It was high quality, a high quality vehicle.

So as well as using numbers, we can also make compound adjectives with the words high or low, plus a noun so high plus quality equals high quality, like high quality vehicle low plus cost equals low cost, like low cost airline.

How do you feel about low cost airlines, Catherine?

Yes, well, after my last experience, never again. Never again. Never, never write some more examples anyway.

Arfin, high speed, a high speed motorbike and low fat and low fat yogurt. And if you're writing, don't forget, join the two parts together with a hyphen.

And now it's quiz time completely sentences. Katherine will tell you the answers. Ready? No one in a balanced diet, it's important to eat a high quality carbohydrates or be high quality carbohydrates.

It's a high quality carbohydrates.

Well done if you got that. Number two, the flight from London to New York is a a nine hour trip or B, a nine hour trip.

The answer is B, a nine hour trip.

Number three, every morning, Catherine goes for a a six mile run or B, a six miles run.

And the answer is a six mile run.

But I don't you don't really deal it in any case. Well done. If you got those right at home and we're almost at the end of the show. But before we go, here's today's top tip for learning vocabulary, which is, Catherine.

If you use social media, join an English learning group. When you learn a new word, try to include it in at least three of your posts that will help you remember the word.

And there's more about this at BBC Learning English dot com. Join us again for more six minute vocabulary by.