I don't think there are different dialects of English in the same way as in Chinese. Just different accents and a fairly small number of differences in vocabulary. Even the accents aren't really that different -- mostly there are differences in the way we say different vowel sounds in the same word.

我觉得英语的方言没有比你们汉语的方言多。大半有两种方言，是英国式或者美国式，就是说English accent or British accent. 不过我不能说明怎么能判断这两种。。但这个区别很明显的，所以如果多听他们的说话（比如电影演员，老师等），我觉得你会知道。