Sigrid explains what cardinal numbers are and gives us some writing and pronunciation tips.

Sigrid finishes the alphabet with "Z," covering words like "zone" and "zebra," but also the useful suffix "-ize."

Anna, from Cambridge University Press, explains how and when to use the Present Simple.

"Y" is a tricky letter because it's both a consonant and a vowel. As a vowel, it has different sounds. Don't worry. But hey, maybe keep your eye on the "Y." Don't let it fly away.

Gabrielle presents three key questions you're likely to face when being interviewed for a job. Her advice is spot on.

Do you want to prepare for that big job interview? If so, take a look. Gabrielle offers some valuable information and a few helpful hints.

"X" is a special letter in that we often use it by itself. It's useful in a lot of situations. In the middle of a word, however, it can be pronounced in a few different ways.

"W" is a consonant, but it is very vowel-like and is considered a "semi-vowel." "W" is featured in plenty of important words, and it combines with other letters to make some new sounds.

"V" is a voiced consonant. "Voice" starts with "V." We make the sound with the upper teeth lightly touching the lower lip, like "F" but with the voice, too. It vibrates. The verb "to vibrate" also starts with "V." That should make it easy to remember.

"U" is an interesting vowel, and has a few different sounds. It can even sound like the consonant "Y," and combines with other vowels to make new sounds.

"T" is for "tricky." Depending on what letters "T" is combined with or next to, it is pronounced differently. Sigrid explains and gives some examples.

Fuse School: Learn the basics about the effects of global warming on the environment. Some of the problems global warming may cause are changing climate, extremes of weather, problems for ecosystems, rising sea levels, and ocean acidification.

The letter "S" has a couple of different sounds. It's a very important letter because it's used to form the plural of many nouns as well as the third person singular of verbs.

The letter "R" is difficult to pronounce for lots of people, even native speakers. Sigrid shows us how "R" sounds in different kinds of words.

The consonant "Q" is a special letter. We almost never find it without a "U" following it. Sigrid gives us plenty of examples of how it's used.