What rule applies most closely to this word? Predict- 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.

The rule that most closely applies to the word "predict" is:

Group I. If the root is a full word, the ending is usually -able.

Explanation:

"Predict" has "dict" as its root, which is a full word, and we know that the correct spelling for its derived form is "predictable". We can, thus, eliminate the last two options. "Predict" does not end in -e, -g, -c, or -a. This is already its complete form. With that in mind, we can easily see that the group I rule is the one that best applies to it. The suffix -able is usually applied to roots that are a full word, which is the case with "predict".

the words "strangest" and "unusual" suggest (: