Question

What rule applies to this word?

desire

Group I. If the root is a full word, the ending is usually -able.
Group II. When the root is a full word except for a final e, the forms usually are spelled with -able.
Group III. The suffix -able always follows i.
Group IV. When the root has other forms built on the letter a, the -able form is used.
Group V. When the root ends in hard c or hard g, -able is used.
Group VI. When the root is not a full word,-ible is used.
Group VII. When the word has an immediate -tion form, -ible is used.
Group VIII. When the root ends in ns, miss, or soft c or g, ible is used.

Answer 1

Group II. The group is a full root word except for a final e. Is what i'm thinking. Sorry I'm unsure.

Answer 2

The rule that applies to the word desire is Group II. When the root is a full word except for a final e, the forms usually are spelled with -able.

Step-by-step explanation:

Suffix -able is used to turn verbs into adjectives and means that something can be done or that is capable of something. There are many spelling rules used to introduce the suffix -able; the one that applies to the word desire is Group II, since it turns the word desire into desirable.