Answer:
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 and drop the finale.
Group III. The suffix -able always follows the letter i. Thus, if you follow our English custom of changing y to i in these words, you will add -able.
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 orhard g, -able is used. The suffix -able is the only possible ending after hard c or g, in order to keep the proper pronunciation.
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.
<span>Lu Han (born April 20, 1990), is a Chinese singer and actor who was a former member of the South Korean-Chinese boy band EXO, and its subgroup EXO-M. He is signed to S.M. Entertainment in South Korea and Avex Trax in Japan</span>
There is an archaic term "Exeunt" used to describe a situation where many characters leave the stage. "Exeunt Omnes" would be the stage direction for everyone to leave.
