BrE generally uses the -s- in all forms and AmE generally uses the -z- in all forms.
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To answer your specific question, British English uses the -ise forms in both present and past tense.
Anonymous:For the first time in history, Google use 'se' instead of 'ze' in one of their global campaigns..
Will it continue?
JustForFun I get kind of confusedTypically, the British form is ise; the American form is ize. Past tense forms and derived noun forms also differ this way.
Nevertheless, I've read that Oxford University (British) prefers ize. The Oxford Dictionary web sites sometimes state that both ize and ise are used in Britain.
Note also that the following words are spelled the same worldwide, in apparent contradiction to the "rule".
advertise, advise, arise, comprise, compromise, demise, despise, devise, disguise, excise, exercise, franchise, guise, incise, revise, rise, supervise, surmise, surprise, televise, and wise
capsize, seize, size, prize
PS Please ignore my earlier post. I could amend it.
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