Do vowels have only one sound for each vowel letter?

No, vowels in English can have multiple sounds, depending on the word and context. This is why English is considered a difficult language to learn. Here's why:

* Multiple pronunciations: The same vowel letter can represent different sounds. For example, the letter 'a' can be pronounced as in "cat", "father", "care", and "about".

* Diphthongs: Some vowels are actually combinations of two sounds. These are called diphthongs, like the sound of 'oi' in "boy" or 'ow' in "cow".

* Influence of surrounding letters: The sound of a vowel can change based on the letters around it. For example, the 'i' in "bit" has a different sound than the 'i' in "bite".

Here's a simplified table showing some of the common vowel sounds in English:

| Vowel Letter | Sound Example | Word Example |

|---|---|---|

| a | as in "cat" | cat, bat, hat |

| e | as in "bed" | bed, ten, get |

| i | as in "bit" | bit, sit, pin |

| o | as in "cot" | cot, hot, lot |

| u | as in "cup" | cup, but, nut |

However, keep in mind: This is a very simplified overview, and there are many more vowel sounds and variations. The best way to learn the correct pronunciation of vowels is to practice reading and listening to English words and phrases.