Rule #2: Prefixes
Root words don't change if they are preceded by prefixes:
     mis + shapen = misshapen
     dis + belief = disbelief
     ex + communicate = excommunicate
     mis + spelling = misspelling

Rule #3: Suffixes
A suffix is an ending. When adding a suffix to words that end with a silent e, keep in mind these two principles:

1. When the suffix begins with a vowel, (usually) drop the e:
             dive + ing = diving
             believe = believable
   

   Note: There are some exceptions: notice + able = noticeable courage + ous = courageous dye + ing = dyeing

2. when the suffix begins with a consonant, (usually) keep the e:
             achieve + ment = achievement
             hope + less = hopeless
   

   Note: There are some exceptions: argue + ment = argument true + ly = truly judge + ment = judgment

1. Before adding the ending, double the last letter of a word . . . if the word is only one syllable long, if it ends in a consonant, and if one vowel comes before the consonant.
• run + ing = running
• plan + ed = planned
2. Don't double the last letter before adding an ending . . . if the word ends in two consonants, or if there are two vowels before the final consonant.
• grasp + ing = grasping
• lead + ing = leading
3. In two-syllable words, double the last letter if
• it is a consonant (fatal = fatally);
• you accent the last syllable when you say the word (preFER + ed = preferred)

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1			admittance
			A)	Correct.
			B)	Incorrect.
2			occurred
			A)	Correct.
			B)	Incorrect.
3			omited
			A)	Correct.
			B)	Incorrect.
4			transferred
			A)	Correct.
			B)	Incorrect.
5			quized
			A)	Correct.
			B)	Incorrect.
6			appearing
			A)	Correct.
			B)	Incorrect.
7			dropping
			A)	Correct.
			B)	Incorrect.
8			stopping
			A)	Correct.
			B)	Incorrect.
9			tipping
			A)	Correct.
			B)	Incorrect.
10			typing
			A)	Correct.
			B)	Incorrect.
11			difference
			A)	Correct.
			B)	Incorrect.
12			existence
			A)	Correct.
			B)	Incorrect.
13			interference
			A)	Correct.
			B)	Incorrect.
14			preference
			A)	Correct.
			B)	Incorrect.
15			reference
			A)	Correct.
			B)	Incorrect.