Syllabication, Accents, Diphthongs and Triphthongs
Syllabication (Silabación):
1. A single consonant (including ch, ll, rr) is pronounced with the following vowels or diphthongs:
ne-ce-si-to
mu-cha-cho 
plu-ma 
mie-do 
tra-ba-jar 
gue-rra 
Es-pa-ña 
ciu-dad 
ca-ba-llo 
 de-se-o
 é-xi-to
li-te-ra-tu-ra
  
2. Combinations of two consonants between vowels or diphthongs are usually separated:
car-ta fuen-te rom-per cuar-to es-tá éx-ta-sis
3. If the second consonant is l or r, the combination is, as a rule, inseparable:
te-a-tro pue-blo re-cla-mar com-prar a-brir in-fluen-cia
4. Exceptions:
Prefixes remain together: sub-ur-bio, dis-or-den
The rr: If a prefix ending in a vowel is attached to a word beginning with r, the word is written with rr but divided with only one: pro+rumpir=prorrumpir, pro/rum/pir

Accents (Acentos):
1. Words ending in a consonant (except n or s), stress the last syllable (agudas)
na-tu-ral tra-ba-jar se-ñor sa-lud   pa-pel fe-liz
2. Words ending in a vowel or the consonants n or s, stress the next-to-last syllable (llanas)
car-ne
ve-ra-no
plu-ma
Es-pa-ña
pre-ci-so
ha-blan
se-ño-ri-ta
a-mi-gos
se-ma-na
u-nos
prin-ci-pio
pa-rien-tes
          
3. Words that do not conform to the rules above bear a written accent mark over the stressed vowel:
A--ri-ca
Mar--nez
-di-co
e-xá-me-nes
ú-ni-co
le-ván-ta-te
ár-bol
án-gel
ja-más
a-llí
tam-bién
pen-sión

co-ra-zón
co-mió
4. A diphthong bearing no written accent mark and composed of:
* a strong (a, e, o) and a weak (i, u) vowel, stresses the strong vowel
cuo-ta mien-tras bien dia-blo gua-pa   au-tor oi-go vio  
* two weak (iu, ui) vowels, stresses the second vowel
triun-fo viu-da  Sui-za rui-do                     

Diphthongs (Diptongos):
  a, e, o are strong vowels; i, u are weak vowels

1. Two strong vowels (a, e, o) cannot stand together in a single syllable.
de-se-o i-de-a te-a-tro  po-e-ma
2. A strong and a weak vowel, or two weak vowels (i, u) together, form a diphthong and hold together in one syllable:
due-ño rui-do siem-pre  bie  Clo-dio his-to-ria
3. If the weak vowel bears a written accent mark, the diphthong is broken into two distinct syllables:
po-e-sí-a tí-o pa-ís Ma-rí-a de-cí-a pa-ra-í-so

Triphthongs (Triptongos):  3 vowels together combined weak/strong/weak
   iai, iau, iei, ioi, uai (uay at the end), uau, uei (uey at the end).
   Broken only when a written accent mark falls on one of the weak vowels