There is no present participle of the word unable because the word implies no action. The present participle of enable would be enabling, as in "He has been enabling her shopping".
The past participle of "choke", which means to be unable to breathe, is "choked". The present is "choking", and the third person singular is "chokes".
Being is the present participle. The past participle is been.
Getting is the present participle of get.
The present participle is doing.
Presenting is the present participle of present.
Presenting is the present participle of present.
The present participle is choosing.
The present participle is walking.
The present participle is cleaning.
The present participle is leading.
The present participle of "understand" is "understanding."
The present participle is swearing.