Note that an asymmetry still exists--the short allophones of /a:/and /[epsilon]:/--[a] and [[epsilon]]--are identical phonetically to the phonemes /a/ and /e/ found in stressed syllables, unlike the other tense vowels
. Stated differently, open vowels are never long in German, except for /a:/ and /e:/.
These generalizations indicate that for Dutch, the distinction between syllables with schwa, open syllables (ending in a tense vowel
), closed syllables (ending in a lax vowel and one consonant), and super-heavy syllables (ending in a tense vowel
and at least one consonant, a lax vowel and at least two consonants, or containing a diphthong) is relevant.
Instead, the ae-tensing phonotactic constraint requires that "plan" surface with a tense vowel
A escala musical varia em altura (pitch)--tendo em conta a frequencia fundamental da vibracao da onda sonora e o som das vogais varia em timbre--dada a frequencia do espectro do som, produzindo vogais agudas e graves; as vogais apresentam igualmente variacao ao nivel da duracao--vogais curtas (lax vowels) e longas (tense vowels
); outras vogais, os ditongos, apresentam propriedades dinamicas.
The problematic tense vowels
in question acquire their second mora when they appear in a stressed position, while retaining their underlying monomoraicity in unstressed positions, in which they traditionally have been regarded as long.
The rules (see Giegerich, 1992, for a good account), or 'schemas', rest on principles of syllabification and on a distinction between light and heavy syllables, which in turn presupposes the distinction between short and long vowels (alternatively, lax and tense vowels
But it matters greatly: if it was already a kind of I, and there were two high tense vowels
(say, [i:] and [iy]) in that vowel space, then no chain shifting occurred of the type described by Labov, in which vowels maintain their distance and move like horses in tandem.