The Macmillan Dictionary regard touching as a formal preposition, and other dictionaries nearly related the prepositions concerning, about, touching as synonyms. So is it fine to use all of three prepositions in written exams, as in:
They had discussed touching the beauty of that place.
They had discussed about the beauty of that place.
They had discussed concerning the beauty of that place.
I don't have an idea which one is more preferable in written exams or other formal speaking occasions?
And the following usage of touching as a preposition lead me towards the confusion, as it looks like present progressive tense:
- It is touching them.
In this case, shouldn't it be like this:
- It is about them.