U: U vs. O
In Spanish, when the word Y appears before a word that begins with the sound /i/, written with or without an H, the Y changes to E. While this rule is quite well known, it seems less well known that that when the word O is used before another word that begins with the sound /o/, with or without H, the O changes to a U.
Correct: En la fiesta sólo había siete u ocho personas, por eso me fui.
(There were only seven or eight people at the party, that’s why I left).
Incorrect: En la fiesta sólo había siete o ocho personas, por eso me fui.
- A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z -