Adding the suffixes to words ending in 'fer'
When you add a suffix to a word ending in 'fer' you sometimes need to double the 'r', but how do you know when?
When you add a suffixes and the second syllable of the new word is stressed, then you need to double the 'r'.
For example, adding the suffix -ed to the word 'prefer':
prefer + -ed → preferred
However, if the 'fer' is no longer stressed once you've added the suffix, then leave it as a single 'r'.
For example, adding the suffix -able to the word 'prefer'.
prefer + -able → preferable
Watch: Adding suffixes to 'prefer'
Adding suffixes -ed and -ing to words ending in 'fer'
Here are some further examples of adding suffixes -ed and -ing to words ending in 'fer'.
Notice how the letter 'r' is doubled in the new word.
Words ending in ‘fer’ | With suffix '-ed' and second syllable stressed | With suffix '-ing' and second syllable stressed |
---|---|---|
prefer | preferred | preferring |
transfer | transferred | transferring |
infer | inferred | inferring |
refer | referred | referring |
It helps to say the words out loud so you can hear the syllable you put a stress on.
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