Pronouncing Two-Vowel Combinations
| Diphthong | Guide | As in | Example | Guide |
| ai | ahy | high | aire | AHY-reh |
| ia | yah | yahoo | piano | pYAH-noh |
| ei | ehy | say | sies | sEHYs |
| ie | yeh | yes | bien | bYEHn |
| oi | ohy | boy | boina | bOHY-nah |
| io | yoh | yoke | nación | nah-sYOHn |
| au | ow | cow | causa | kOW-sah |
| ua | wah | wasp | cuatro | kWAH-troh |
| eu | ehw |
|
europa | EHW-roh-pah |
| eu | weh | sway | bueno | bWEH-noh |
| ui | wee | sweet | cuidado | kWEE-dah-doh |
| iu | yoo | you | ciudad | sYOO-dahd |