How to add suffixes to words ending in -ferVideo TranscriptupdownLet'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.When do you double the r?Add your suffix and say the word aloud.If the -fer is still stressed then double the r, like preferred.If the -fer is no longer stressed then leave it as a single r, like preferable.Start activityJavaScript is required to view this activity.