What are the 20 vowels of English language?

There are not 20 vowels in the English language. There are only 5 vowel letters in the English alphabet:

* A

* E

* I

* O

* U

However, the number of vowel *sounds* in English is much larger and depends on how you count them. Some linguists suggest there are around 20 different vowel sounds in standard American English. These sounds can be represented by a combination of vowel letters and sometimes even other letters or symbols.

For example, the vowel sound in "cat" is different from the vowel sound in "car," even though they are both spelled with the letter "a."