规则动词的双写规则
2026年2月4日One-syllable words
In a one-syllable word that ends in a single consonant preceded by a single vowel (e.g. bed), double the final consonant before the suffix y or any suffix beginning with a vowel:
- fat: fatty
- sun: sunny
- bed: bedded
- dip: dipped
- fit: fitted
- flit: flitting
- log: logged
- mad: madden
- rot: rotted
- scrub: scrubbing
- sit: sitting
- stop: stopping
Do not double the final consonant in a word of one syllable if the vowel sound is long:
- boat: boating
- light: lighten
- read: reading
- stoop: stooped
Two-syllable or longer words
In words of more than one syllable ending in a single consonant preceded by a single vowel, the final consonant is doubled if the accent of the new word is on the second-to-last syllable and the suffix begins with a vowel:
| base form | with suffix | correct spelling |
|---|---|---|
| ac’quit | acu’qit-al | acuqittal |
| com’mit | com’mit-al | committal |
| oc’cur | oc’cur-ence | occurrence |
| per’fer | ‘perfer-ence | preference |
| per’fer | per’fer-ed | preferred |
| re’bel | re’bel-ion | rebellion |
| re’gret | re’gret-ed | regretted |
| trans’mit | trans’mit-ed | transmitted |
Note that there is no doubling of the consonant in targeted and benefited, since the accent is not on the last syllable in target and benefit.