Page 246 - Basic English Usage

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A number of longer words only have -ise, in both British and American
English. These include:
compromise exercise improvise supervise televise
advertise (US also aavertize)
Note also analyse (US analyze).
\f in doubt, use -ise — it is almost always correct, at least in British
English. -

327 spelling: -ly

We often change an adjective into an adverb by adding -ly.
late lately right rightly hopeful hopefully
real really(NOT teaty) _— definite definitely
complete completely (NOT eempletty)

-y changes to -/- (see 328).
happy happily easy easily dry drily

lf an adjective ends in -/e, we change -/e to -ly.
idle idly noble nobly

If an adjective ends in -ic, the adverb ends in -ically.
tragic tragically

Exceptions: truly, wholly, fully, shyly, publicly.

328 spelling: yand ij

When we add something to a word that ends in -y, we usually change
-yto -i-.
hurry hurried marry marriage
happy happily fury furious
easy easier merry = merriment
busy business
Generally, nouns and verbs that end in -y have plural or third person
singular forms in -/es.
story stories hurry hurries spy spies
We do not change -y to -/- before -/- (for example, when we add -ing,
-ish, -ism, -ize).
try trying Tory Toryism baby babyish