DB Literacy Spellings

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Adding suffixes beginning with vowel letters to words ending in – fer

The r is doubled if the –fer is still stressed when the ending is added. The r is not doubled if the –fer is no longer stressed.

conferring conferred
deferring deferred
inferring inferred
preferring preferred
referring referred
transferring  transferred
referencing referenced
refereeing refereed
buffering buffered
differing differed
offering offered
suffering  suffered
interfering interfered