Let’s try vaguely edible this time, and I’d prefer it if you didn’t make a mess, ok?
In the word prefer, the second syllable is stressed.
You can check where the stress is by saying the word out loud - prefer.
And when the ‘fer’ is stressed, you add an extra r as well as the suffix.
Your preferred topping is chocolate buttons.
But you would find icing preferable.
Now the ‘fer’ isn’t stressed. Preferable.
So this time we can just add the suffix and no extra r.
My preference is that you stop baking and go outside.
Description
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
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