American Eng.: Grammar:
Differences in grammar are relatively minor. These include, but are not limited to: different use of some verbal auxiliaries; formal (rather than notional) agreement with collective nouns; different preferences for the past forms of a few verbs; different prepositions and adverbs in certain contexts (e.g. AmE in school, BrE at school); and whether or not a definite article is used, in very few cases (AmE to the hospital, BrE to hospital, BrE: in a street; AE: on a street). Often, these differences are a matter of relative preferences rather than absolute rules; and most are not stable, since the two varieties are constantly influencing each other.
In BrE, collective nouns can take either singular (formal agreement) or plural (notional agreement) v.forms, according to whether the emphasis is: on the body as a whole or on the individual members. In AmE, collective nouns are usually sing. in construction. AmE, however, may use plural pronouns in agreement with collective nouns: the team take their seats.
BrE: The Beatles are a well-known band; AmE: The Beatles is a well-known band.
The P. tense and past participle of the verbs learn, spoil, spell, burn, dream, smell, spill, leap and others, can be either irregular (learnt, spoilt, etc.) or regular (learned, spoiled, etc.). In BrE, both irreg. and reg.forms are current, but for some words (such as smelt and leapt) there is a strong tendency towards the irreg. forms, especially by users of Received Pronunciation. For other words (such as dreamed, leaned and learned) the reg. forms are more common. In AmE, the irreg forms are never or rarely used (except for burnt and leapt).
The form gotten is very common in North AE. BrE: get - got – got, AE: get- gotten - gotten
Lit as the P tense of light is more common than lighted in the UK; the reg. form is used more in the US. But fit as the past tense of fit is more widely used in AmE. In BrE, - fitted.
BrE uses the Pr perf. tense to talk about an event in the recent past and with the words already, just, and yet. In AE these meanings can be expressed with the Pr.P. (to express a fact) or the P.S.
BrE:"I've just arrived home." – AE: "I just arrived home."
BrE: "I've already eaten." - AE:"I already ate."
In BrE, have got or have can be used for possession and have got to and have to can be used for the modal of necessity. The forms that include ‘‘got’’ (have you got, he hasn't got , etc.) are usually used in informal contexts and the forms without got in contexts that are more formal. In AE the form without got (do you have, he doesn't have etc.) is used more than in the UK. Colloquial AmE informally uses got as a verb for these meanings – for ex, I got two cars, I got to go.
In BrE: needn't + V или don't need to + V; AE -only don't need to
After talk Br. always uses to, American can also use the preposition with
Br. sportsmen play in a team; Am.-play on a team. (Both may play for a particular team.)
BrE favours the construction "at the weekends"; the constructions on and during the weekends are more common in AmE than BrE.
Both Br & Am may say, for ex.: a river is named after a state, but "named for a state" would rightly be regarded as an Americanism.