If you have a rhotic accent, you pronounce the /r/ sound whenever the letter 'r' appears in a word, like in 'learn', 'better' and 'perfect'. North American accents are usually rhotic, and other ...
If you have a non-rhotic accent, like Beth and Georgie, you don't pronounce the /r/ at the end of words like 'better' or between a vowel and a consonant, like in 'learn', but you do pronounce the ...