Grammatical differences between American English and British English

BrE sometimes uses the present perfect while simple:AmE use the past

BrE:

Have you eaten all those biscuits?

AmE:

Did you eat all those cookies?

BrE:

Have you ever seen the film, Casablanca?

AmE:

Did you ever see the movie, Casablanca?

BrE uses have got while AmE tends to use have:

BrE: Have you got new training shoes?
AmE: Do you have new sneakers?
BrE: I've got some Wellington boots you can borrow.
AmE: I have some galoshes you can borrow .
BrE: I have n't got time for a holiday this year.
AmE: I don't have time for a vacation this year.

There are some differences inirregular verbs between AmE and BrE. Two major differences are:

BrE: dive - dived - dived She dived into the pool.
AmE: dive - dove - dived She dove into the pool.
BrE: get - got - got The baby has got a lot bigger.
AmE: get - got -gotten The baby has gotten a lot bigger.

BrE uses from...to/till/until while AmE uses from...through:

BrE: The optician is open from eight till four.
AmE: The optometrist is open from eight through four.

There are also a number of other differences in BrE and AmE prepositions, e.g. different to/than, at/on the weekend, ten past/after midnight.

BrE can use shall for offers and suggestions while AmE uses should:

BrE: Shall I call a taxi?
AmE: Should I call cab?

BrE uses a lot ofquestion tags. AmE does not; instead it uses words like right and ok:

BrE: I'll park on the verge, shall I?
AmE: I'll park on the shoulder, right?

BrE can use a singular or plural verb for collective nouns while AmE uses only a singular verb:

BrE: The team are playing badly.
AmE: The team is playing badly.

In informal speech, AmE sometimes useadverbs without the -ly ending:

BrE: Autumn was really cold this year.
AmE: Fall was real cold this year.

With double imperatives beginning with go, AmE sometimes drops the joining and:

BrE: Go and open the door.
AmE: Go open the door