LET ME CORRECT THIS , -IAL CAN BE ADDED
Industrial
The suffix that should be added to the word "courtesy" to make it mean "full of courtesy" is "-ous," resulting in the word "courteous."
A suffix is added to the end of a word to modify its meaning.
-ics
A suffix is added at the end of a word. A prefix is added at the beginning.
There is a suffix because "achieve" is the root word and "ed" is the added part, so it is a suffix. A prefix is added at the beginning of a word and a suffix is added to the end of a word.
The suffix "-ing" can be added to "shape" to form the word "shaping."
It is a suffix.
The suffix -ly.
The suffix "ous" is added to the word "Treacher" which is not the root word but the root word is not far off, as it is treachery.
Yes, "multicellular" has a suffix. The suffix "-ar" is added to the root word "cell" to form "cellular," and then "multi-" is added as a prefix to form "multicellular."
needful as an adjective for need the suffix is "ful"