1.Use of the Present Perfect
I've lost my keys. (British)
The Britts express possession with have got
Do you have a car? (American)
Have you got a car? (British)
3.The Verb Get
The past participle of the verb get is gotten in American English.
He's gotten much better at playing tennis. (American)
He's got much better at playing tennis. (British)
Some words change in the two varieties, for example:
An elevator in the US is a lift in the UK
Apartment = Flat
Band-aid = Plaster
Can = Tin
Fall = Autumn
Gas = Petrol
Guy = Bloke
Highway = Motorway
Line = Queue
Pants = Trousers
Two general differences between British and American spellings:
Words ending in -or (American) -our (British)
color, colour, humor, humour, flavor, flavour etc.
Words ending in -ize (American) -ise (British) recognize, recognise, patronize, patronise etc.