Received Pronunciation
English dialects differ greatly in their pronunciation of open vowels. In Received Pronunciation, there are four open back vowels, , but in General American there are only three, , and in most dialects of Canadian English only two, . In addition, which words have which vowel varies between dialects. Words like "bath" and "cloth" have the vowels in Received Pronunciation, but in General American. The table above shows some of these dialectal differences.