The only exception to this rule is when the addition of the suffix throws the accent back to a preceding syllable. When this is the case, the final consonant is not doubled. For example: refer, referred, ref'erence; confer, conferring, con'ference.
Look up the following words in the dictionary, watch for the accent, mark and add the suffixes, ed, ing, ence or ance, if possible.
Monday
- Repel
- Alter
- Prefer
- Debar
- Answer
Tuesday
- Inter
- Offer
- Demur
- Wonder
- Succeed
Wednesday
- Detain
- Combat
- Compel
- Occur
- Cancel
Thursday
- Permit
- Travel
- Repeal
- Control
- Profit