If you want to speak a different language, or speak in a different accent, you will need to use different vowels from the ones you normally use. This document tells you how to make any required vowel in any language or accent. It does this by teaching you how to make nine reference vowels, and by explaining the mechanisms that produce them. You can then use these mechanisms to produce any required vowel in any language or accent.
1. Specifying vowels
The sound of a vowel is determined by three factors: whether or not the lips are rounded, the shape of the tongue, and the position of the tongue. (A possible fourth factor, whether or not the vowel is sounded partly through the nose, can be disregarded for present purposes.)
1.1. Lip rounding
Rounding the lips means pulling their corners towards the middle so that the mouth forms an O. Lip rounding is clearly a continuum: the lips can be fully spread, fully rounded, or somewhere in between. For present purposes, however, we need only distinguish between unrounded lips (the corners not drawn in at all) and rounded (the corners drawn in to a moderate degree).
1.2. Tongue shape
When speakers make vowel-sounds, they tense one part of the tongue, making a hump that is higher than any other part of the tongue. 'The shape of the tongue' refers to this hump. So a 'front' vowel is one made by tensing and raising the front of the tongue, a 'central' vowel is made by tensing and raising the central band across the tongue, and a 'back' vowel is made by tensing and raising the back part of the tongue.
1.3. Tongue position
The tongue can be positioned high or low in the mouth. A 'close' vowel is one where the hump of the tongue is held high in the mouth, and an 'open' vowel is one where the hump of the tongue is held low in the mouth.
The shape and position of the tongue, like lip rounding, are on a continuum - any part of the tongue can be tensed, and the hump can be placed anywhere in the mouth. Moreover, small differences make significant differences to the sounds of the vowels. So we need some way of notating the shape and position of the tongue, to represent different vowels. This is done on a vowel-chart.
2. The vowel-chart
The vowel-chart shows a blob and a phonetic symbol for each vowel, and has grid-lines that mark standard positions.
The left of the chart represents the front of the mouth, and the right of the chart represents the back of the mouth; the top and bottom of the chart represent the roof and floor of the mouth respectively. So a blob on the left of the chart represents a vowel for which the front of the tongue is humped, and a blob on the right of the chart represents a vowel for which the back of the tongue is humped. Likewise a blob at the top represents a vowel made with the tongue-hump near the roof of the mouth, and a blob at the bottom of the chart represents a vowel made with the tongue-hump near the floor of the mouth. Since the tongue can move anywhere in the mouth, a blob can be placed anywhere on the chart to represent that tongue position. Here we're concerned only with the nine blobs shown.
It's convenient to have standard named positions on the chart for particular degrees of high and low, front and back. The three degrees of frontness and backness are called front, central and back; the four degrees of height are called close, close-mid, open-mid and open.
Each blob on the vowel-chart has a printed letter - the symbol for that vowel - associated with it. If the symbol is to the left of its blob, the vowel is unrounded (i.e. made without lip rounding). If the symbol is to the right of its blob, the vowel is rounded.
From these standard terms we can derive a three-word description for each vowel. The vowel at the top left of the chart, for example, is a close front unrounded vowel; the one at the bottom right is open back unrounded, and the second one down on the right is a close-mid back rounded vowel. This three-word description constitutes the specification for that vowel.
3. Making vowels
Now it's time to make some vowels.
3.1. First steps
The four vowels above were in extreme positions - as close or open, front or back as possible. For the next four vowels you have to place your tongue in intermediate positions, which is more difficult.
3.2. Concentrated practice
3.2.1. With voiceless breath
For more concentrated practice, make the vowels with voiceless breath, as follows:
3.2.2. Vowels at the same height
Another way of practising is to work on pairs of vowels at the same height. Start with the front vowel and move the hump tongue slowly back along your tongue, keeping it at the same height, and making a sound the whole time; round the lips progressively if the back vowel requires it. You should hear the front vowel change gradually into the back vowel. Then do the same in reverse.
4. Knowing the system
Given that you can use these nine vowels to locate and produce any other vowel in any accent or language, it's worth making sure that you know the system that underlies them and links them together. There are four things you need to know about each of these nine vowels:
4.1. Three-word description
The first word in the three-word description denotes the tongue height, the second word denotes the frontness or backness of the tongue-hump, and the third word indicates whether the lips are rounded or unrounded:
The ninth vowel, whose height is between close-mid and open-mid, is (exceptionally) described as mid: a mid central unrounded vowel. Lip rounding is shown on the chart by whether the symbol is to the left or the right of its vowel.
Contrary to what one might think, listening to the recordings is not by itself a good way to learn the sounds of these vowels. The secure way of learning them is to place the tongue and lips in the required position, making sure that the appropriate part of the tongue is tense, then keep them firmly in place and see what vowel comes out. Check this sound against the recording, and adjust the tongue configuration and lip rounding until the two sounds match.
The position of a vowel on the chart is shown by the first two words of its three-word description. If you know one, you know the other.
The chart shows the phonetic symbols normally used for these vowels. Some of these symbols are the same as ordinary letters, but the sounds they represent are not the sounds they normally have in English; they are the sounds that they historically had in Latin, and still have in many European languages. In French, for example, the letter i normally represents the sound of the first reference vowel ('ville', 'fils'). Some letters still represent these sounds in some English words: the letter i has the sound of the first reference vowel in the English word 'machine', for example, and the letter u has the sound of the eighth reference vowel in English 'brute' (in a south-of-England accent). The nine symbols are usually called 'letter I', 'letter E', 'Greek E', 'curly-topped A', 'round-bellied A', 'broken O' or 'reversed C', 'letter O', 'letter U' and 'turned (meaning upside-down) E'.