I feel I must qualify my earlier remarks in case they are misinterpreted.
In "the open door," open is an adjective qualifying door.
Could I use modify and modifying to replace qualify and qualifying in the above contexts without making a change in meaning?
A lot of prescriptions are based on Latin meanings and Latin grammar. The old canard about 'not using a preposition to end a sentence with' is based on the meaning of pre-; if the very word "preposition" means "situated before" - so goes the specious argument - a preposition has to come before at least a noun (and so can't come right at the end of a sentence).
Modus refers to a method or means or way of doing something; this makes "modify" seem to be suitable for adverbs. Qualis asks what something is like; this makes "qualify" seem to be suitable for adjectives (words that refer to the quality of a noun). Note my use of 'seem to'; I don't believe in this 'rule'.
Thanks, Bob, for the most entertaining as well as instructional info.
Now I get the hang of it.
By the way, I know that preposition signifies put (pos-) before (pre-) but all languages are changing. We have to accept the truth and never stick to old grammar or principles. In this respect, I'm more of descriptive points of view.
Thanks again for the wonderful Latin lesson. I hope we can read more of your Latin explanation.