Comparative deletions - Deleting the Standard
Comparative deletions are hypnotic words where we make a comparison but don't explain what we are comparing. There is some kind of standard or judgment involved, but it isn't made clear.
Ly Adverbs - Obviously this is Useful
Ly Adverbs are words with an "ly" on the end, like unfortunately. I have to admit I didn't pay much attention to those "parts of a sentence" things in English, so don't ask for the simple explanation.
Simple deletions
Simple deletions are where part of the meaning are left out or lost. You can notice them in sentences with it and that. Also when referring to missing descriptions (adjectives) - as in "Please give me the report."

