Question

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 g, -able is used.

Answer 1

Here are the questions:
1. desir____ - -able or -ible
Which is group is it apart of?
DESIRABLE - Group II

2. envi____ - -ible or -able
Which group is it apart of?
ENVIABLE - Group III

3. Person____ - -ible or -able?
Which group?
PERSONABLE - Group I