1. Place the labels FRONT CENTRE BACK and OPEN MID CLOSE in the vowel quadrilateral below. Then, locate the 12 pure vowels of English. Finally, state whether each vowel is articulated with ROUNDED, UNROUNDED, or NEUTRAL lips.

2. Now locate the pure vowel symbols which begin the glides for each of the eight diphthongs, and the pure vowel symbols that end the glides. Then draw an arrow to show the direction in which the tongue moves. Follow the example. Which diphthongs are CLOSING? Which are CENTRING? Why?