| The knowledge of Spanish spelling rules is extremely important to understand verb forms that might otherwise seem puzzling. |
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| The pronunciation of the consonants g | c | z change when followed by the vowels i | e. In order to keep the original consonant pronunciation across all vowels the following spelling rules take place. |
| ga | ge | gi | go | gu becomes ga | gue | gui | go | gu as with apagar, jugar |
| ca | ce | ci | co | cu becomes ca | que | qui | co | cu as with buscar, tocar |
| za | ze | zi | zo | zu becomes za | ce | ci | zo | zu as with cocer, comenzar |
| a + ie is written aye as in "cayeron", "cayendo" forms of caer |
| a + io is written ayo as in "cayó" form of caer |
| o + ie is written oye as in "oye", "oyes", "oyen", "oyeron", "oyendo" forms of oir |
| o + io is written oyo as in "oyó" form of oir |
| e + ie is written eye as in "leyeron", "leyendo" forms of leer |
| e + io is written eyo as in "leyó" form of leer |
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