Can you tell me how the ''r'' sound is pronounced in British English?
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The IPA transcriptions for BrE are as follows:
If you look the words up at dictionary.cambridge.org, you can press a button to hear the pronunciations.
There is no /r/ in any of these words. You may be interested to know that:
At the end of a word, /r/ is never pronounced - unless the following word starts with a vowel, and then a "linking r" may optionally be pronounced (but some speakers use a "linking r" even if the spelling of the previous word ended with a vowel instead of an "r" - so "America is" may become "America-r-is" for some speakers).
Disclaimer: there are a variety of accents in use in the UK. Some speakers are rhotic (they pronounce /r/ before consonants and at ends of words), but non-rhotic accents are much commoner in England (at least). Rhotic accents are less prestigious in England, and have been on the decline for centuries.