Words ending in -ize or -ise

Verbs in British English that can be spelled with either -ize or -ise at the end are always spelled with -ize at the end in American English. Verbs in British English that end in -yse are always spelled -yze in American English:

Words ending in a vowel plus l

In British spelling, verbs ending in a vowel plus l double the l when adding endings that begin with a vowel. In American English, the l is not doubled:

Nouns ending with –ence

Some nouns that end with -ence in British English are spelled -ense in American English:

Nouns ending with –ogue

Some nouns that end with -ogue in British English end with either -og or -ogue in American English:

BRITISH VS AMERICAN ENGLISH

British	American
The Present Perfect is more common: I've lost my key. Have you seen it? I'm not hungry. I've just had lunch.	The Past Simpleis more common: I lost my key. Did you see it? I'm not hungry. I just had lunch.
havea bath, havea shower, havea break, havea holiday	takea bath, takea shower, takea break, takea vacation
at the weekend / at weekends: Will you be here at the weekend?	on the weekend / on weekends: Will you be here on the weekend?
at university / school She studied chemistry at university.	in university / school She studied French in high school.
at the front / at the back (of a group etc.) Let's sit at the front (of the cinema).	in the front / in the back (of a group etc.): Let's sit in the front (of the movie theater).
write to smb. I promised to write to her every day.	write smb. I promised to write her every day.
Nouns like government/team/familyetc. can have a singular or plural verb: The team is/are playing well.	These nouns normally take a singular verb in American English: The team is playing well.
Some verbs (burn, spelletc.) can be regular or irregular (burned/burnt, spelled/speltetc.)	Verbs are often regular (burned, spelledetc.)
V3 of getisgot:Your English has got much better.	V3 of getisgotten:Your English has gotten much better.

Написание дат в британском и американском английском тоже отличается:

Британский: день - месяц - год (11/10/12 - 11 октября 2012 года)

Американский: месяц - день - год (11/10/12 - 10 ноября 2012 года)