In passing from _ng_ to _ee_ be very careful not to change the initial focus or lose the sensation of nasal and head resonance.

Do not therefore move the lips or the chin.

The only change at this point is the slight movement of the tongue required to pronounce _ee_, which must be a pure vowel without a trace of the preceding _g_.
3.

In passing from _ee_ to _oo_, from _oo_ to _oh_, and so on, do so with the least possible movement of lips and chin.

_The initial sensation of nasal and head resonance must not be lost._ 4.