Grammar differences are relatively small and normally have no effect on mutual understanding; includes: usually a lack of differentiation between adjectives and adverbs, using equivalent adjectives as adverbs, it worked quickly/it ran quickly; Different use of certain auxiliary verbs formal (rather than fictitious) agreement with collective subtantes; different preferences for past forms of a few verbs (p.B. AmE/BrE: learned/learned, burnt/burned, snuck/sneaked, dove/dived), although so-called “British” forms are sometimes visible in American English writing; Different prepositions and adverbs in certain contexts (for example. B, AmE at school, BrE at school); and if a particular article is used, in very few cases (Ame in the hospital, BrE in the hospital; on the other hand, the AmE actress Elizabeth Taylor, BrE the actress Elizabeth Taylor). Often, these differences are more a matter of relative preferences than absolute rules; and most are not stable, as the two varieties constantly influence each other and American English is not a standard set of dialects. Most Americans retain all the historical sounds /ɹ/, with what is called the rhotic accent. The only traditional regional (or non-rhotic) R-dropping accents of the United States are spoken in varying degrees in eastern New England, New York City, and some of the ancient southern plantation especially among the ancient locus (and thus the variable African-American English throughout the country), although the cluster of vocal consonants in bird, work, learning, etc. generally retains its pronunciation, including in these non-rhotic American accents. Non-obesity among these speakers is thought to have originated from their upper-class close historical contact with England, which mimics London`s R-Dropping, a characteristic that has gained prestige throughout England since the late 18th century, but which has lost prestige in the United States since at least the early 20th century.  Non-rhotizity makes a word sound like a car like Cah or source like sauce.  Several other phenomena serve to distinguish American regional accents. Boston, Pittsburgh, Upper Midwestern and Western U.S.
Akzente have completely concluded a fusion of the LOT vocality with the vowel THOUGHT (////)):  a captive child bed fusion that is rapidly spreading throughout the country. However, the south, the northern Inland and a northeastern coastal corridor, Rhode Island, New York City, Philadelphia and Baltimore, generally retain an older distinction, fished by cribs.  For this northeast corridor, the realization of the THOUGHT vocality is particularly marked, as illustrated by humorous spellings, as in Tawk and Cawfee (talk and coffee) who want to present it as tense and diphthongal: [o].  A division of TRAP into two distinct phonemes, the different pronunciations z.B out of step with gas [e], New York City and philadelphia-Baltimore accents further.  American English varieties contain many models of pronunciation, vocabulary, grammar and, in particular, spelling, which are unified throughout the country, but differ from other English dialects around the world.  Any American or Canadian accent, perceived as free of local, ethnic or cultural markers, is commonly referred to as “General” or “Standard” American, a fairly uniform continuum of accents found in some parts of the United States.