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One syllable words 單音字
Double the final consonant when the last two letters of a word are a single vowel letter (a, e, i, o, u) followed by a consonant letter.
get – getting ( e 是 vowel, t 是 consonant )
swim –swimming ( i 是 vowel, m 是 consonant )
plan – planning ( a 是 vowel, n 是 consonant )
Exceptions:
Do not double the consonant if the vowel is written with two letters (兩個 vowel一起)
look = looking, float – floating, eat - eating
The letters w and y count as vowels when they come after a vowel. So there is no doubling in these cases.
Blow – blowing, sew – sewing, grow – growing, row – rowing
Play – playing, pay – paying, say – saying, buy – buying
Never double on x.
Box – boxing, tax – taxing, vex - vexing
Two- or three- syllable words: 雙音字, 三音字
Double the final consonant as in one syllable word, if the last vowel in the word is stressed (as in (A) bellow), but not if it is unstressed (as in (B) bellow)
(A) admit – admitting (“mit” is stressed 重音, not “ad” )
begin –beginning (“gin” is stressed, not “be”)
occur – occurring (“cur” is stressed, not “oc”)
prefer – preferring (“fer” is stressed, not “pre”)
(B) develop – developing (“ve” is stressed, not “lop”)
enter – entering ("en” is stressed, not “ ter”)
visit – visiting (“vi” is stressed, not “sit”)
slow - slowing
slay - slaying
relax - relaxing