How do you pronounce the letter r?

Answer 1

I presume that you mean how to pronounce the letter R in English. How and when you pronounce the letter R depends on whether you speak or want to speak British or American English.

Generally speaking the letter R is always pronounced in American English and is often not pronounced in British English.

Here is a link to tell exactly how and when to pronounce the letter R. The article explains the pronunciation if the letter R in a very clear way, there are some multiple choice questions with answers and explanations.

http://www.squidoo.com/quiz-when-to-pronounce-the-letter-r-in-british-english

Answer 2

The letter "r" is pronounced by making a voiced, alveolar, or post-alveolar approximant sound in English. The tip of the tongue may or may not make contact with the alveolar ridge while producing this sound.