Is "A choking gall and a preserving sweet." a gerund of gerund pharse.

Neither.

In that phrase, choking and preserving are participles (verbal adjectives) -- the first modifies "gall" and the second modifies "sweet."

Is it participle phrase or participle then?

To determine whether "A choking gall and a preserving sweet" is a gerund or a gerund phrase, we need to understand what a gerund is.

A gerund is a verb form that functions as a noun and ends in -ing. It is derived from a verb but functions as a different part of speech. For example, in the sentence "I love swimming," "swimming" is a gerund and functions as the object of the verb "love."

In this case, "A choking gall and a preserving sweet" is not a gerund, but rather a noun phrase. It contains two nouns ("gall" and "sweet") that are connected by the conjunction "and." The phrase does not function as a verb, but instead describes two things.

If you want to determine whether a particular phrase is a gerund or a gerund phrase, you should look for the following:

- Does the phrase end in -ing?
- Does it function as a noun in the sentence?
- Is the phrase being used as the subject, object, or complement in the sentence?

By considering these criteria, you can identify whether a given phrase is a gerund or a gerund phrase.