Speaking clearly. Improving voice and articulation: Фонетический практикум. Фомиченко Л.Г. - 21 стр.

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      The eight di phthongs are usually grouped into three types, de-
pending on the tongue movement involved.
      The first group ends with a glide towards the [!] vowel in the
centre of the mouth,and are called centring di phthongs. They are heard
in the words «here», «air» and «sure». The remainder end with a glide
towards a higher position in the mouth, and are called closing di ph-
thongs. One type of closing di phthong moves in the direction of a [i]
quality at the front of the vowel area. These sounds are heard in the
words «they», «cry» and «toy». The other type of closing di phthong
moves in the direction of [u] qaulity at the back of the vowel area (and
thus adds some li p rounding). These sounds are heard in the words
«so» and «how».

                          S E C T I O N II
                         (American notation)


                         VOWEL SOUNDS
     1. The long a.
       a) The day May plays, Ray remains and finds ways to stay,
          weighing his crayfish daily.
       b) Is it crazy to say the raisins on the gray tray stay today?
     2. The short a (aah).
       a) Can the tan man carry sand as fast as rabbits ran?
       b) Land is grand but Sam demands amnesty.
     3. The broad a (aw).
       a) I thought not, but ought to have sought Maud’s awful
          daughter’s awesome thoughts.
     4. The forward ah.
       a) Father was blah. Aloha to Ma.
       b) Modern moms are not Tod’s toddling sobs.
     5. The long e.
       a) Queenie sees he greets a leech.
       b) See the green trees lean in between Lee’s feet.