I

If letter 'I' not accentuated and it’s is followed by another non- accentuated vowel
The vocalic can be pronounced in two different ways:
1. The vocalic is pronounced in only one syllable
And vowel ‘I’ changes to a semivowel
(fé-rias ['fɛ.ɾjɐs]);
vecation

2. The vocalic is pronounced in 2 different syllables

Letter I is a complete vowel
(fé-ri-as ['fɛ.ɾi.ɐs]).
Vacation
Use the first way, because it’s more common


U

If letter 'I' not accentuated and it’s is followed by another non- accentuated vowel
The vocalic can be pronounced in two different ways:
1. The vocalic is pronounced in only one syllable
And vowel ‘U’ changes to a semivowel
(tê-nue ['te.nwɪ]);
Tenuous

2. The vocalic is pronounced in 2 different syllables

Letter (U) I is a complete vowel
(tê-nu-e ['te.nu.ɪ]).
Tenuous


oi [o:ɪ]

When these vowels come together, they always are pronounced in only one syllable, without splitting them
For example
(coi-ta-do [ko:ɪ'ta.dʊ]).
Poor

oí [o'i]

So when vowel í comes accentuated, with letter O, so we split the vocal into 2 different syllable, and we pronounce letter í stressed (Tônica)
For example
(e-go-ís-mo [e.go'iz.mʊ]).
Selfishness

ói [ɔ:ɪ]

When these vowels come together, they always are pronounced in only one syllable, without splitting them
For example
( fa-róis [fa'ɾɔ:ɪs]).

ou [o:ʊ]

When letter O is followed by letter U, we pronounce them in only one syllable
For example
(lou-co ['lo:ʊ.kʊ]).
Crazy
The pronunciation [o: ʊ] may possibly be reduced to [o]
(lou-co ['lo.kʊ]).

oú [o'u]

So when vowel Ú comes accentuated, with letter O, so we split the vocal, and the accentuated letter Ú would be In a different syllable, and we pronounce it stressed (Tônica)
For example
(oúco, [o'u.ku]).

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