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 hardc or 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.
What ending should this word have? What mnemonic group applies most closely to it?
avail
Group: |
I

Acquiring english is a way of learning where you learn english by birth, this includes listening to your parents, brothers and sisters and on the whole learning it from the environment around you while mastering standard english need qualified institutes and teachers who make certain programs and syllabus to you master the standard english. this also can include a long session of academic studies before you can master the standard english.standard english is necessary for literary works, official usage and writing materials for standardized publications or when someone needs to speak publicly. in most cases the employers of a company also demand and like the use of standard english from their employees. 

Ithink it is yeheil, c if your using edgenuity