Common Mistakes : Different

adjective

.BAD: London is different of Hong Kong
.GOOD: London is different from/to Hong Kong

.BAD: In Argentina, Christmas celebrations are completely different as the ones in England
GOOD: In Argentina, Christmas celebrations are completely different from/to the ones in England

: A is different from/to B
.Alex was different from all the other boys she knew
.Note that most teachers and careful users prefer from

.DUBIOUS: My new school is very different than the old one
.GOOD: My new school is very different from/to the old one

.Different than is used in American English but is rarely used in British English