I suppose being a Brit., I should to use -ise instead of -ize? For example, realise/realize. I prefer to use -ize in most cases. Any rules say I can’t?
I am pleased to report that British usage and American usage agree on the spelling of the verb realize.
Look up “realise” in the OED and you will be taken to the entry for realize.
The spelling “realise” is, however, a recognized alternate spelling of realize.
H. W. Fowler makes it clear that most English verbs that end in -ize or -ise and are pronounced [iz] go back to a Greek ending that contains a z. He points out that although British printers of his time follow the French practice of converting the z to an s in such verbs, the OED and other respected authorities prefer to keep the z.
Both Yanks and Brits are allowed to use the -ize ending in most instances, for example:
Nevertheless, English being what it is, there remains a small group of verbs that call for the -ise ending on both sides of the Atlantic. These are verbs that, according to Fowler,
do not get their -se even remotely from the Greek -izo, & must be spelt with -s-”
Here are the most common -ise verbs: